Drill Bits
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 100mm (4") Diamond coated tip drill bit hole saw drills US $18.99 
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 5/8" diamond drill bit US $5.91
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 2-3/4" Diamond Drill bit bits Ceramic PorcelainTile Glass, Marble GRANITE STONE US $21.65
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 STAINED GLASS SUPPLIES 10 PIECE DIAMOND DRILL BIT SET US $20.00
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 (4) 1mm JEWELRY PENDANT CLASP DIAMOND DRILL BITS US $7.55
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 3 pc DIAMOND TILE GLASS MARBLE HOLE SAW CORE DRILL BIT US $17.99
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 11mm to 25mm Diamond coated drill bit hole saw drills marble US $13.99
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 5pcs Diamond drill bit set Sea GLASS** CLEARANCE US $8.41
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 50mm 2" Diamond coated drill bit hole saw drills marble US $8.99
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 1/8" Diamond Tile Glass Marble Hole Saw Drill bits US $2.75
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 3/16" Diamond Tile Glass Marble Hole Saw Drill bits US $3.00
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 3/8" Diamond Tile Glass Marble Hole Saw Drill bits US $4.75
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 50 pieces jewelry diamond drill bits sea glass agate 1.5mm dremel US $85.00
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 NEW 20 22 25mm Diamond coated drill bit hole saw drills US $5.99
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 1" DIAMOND COATED DRILL BIT GLASS BLOCKS US $5.74
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 1/4" - 1" DIAMOND TILE GLASS HOLE SAW CORE DRILL BIT US $28.99
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 Glass Tile Hole Cutting Saw Drill Bit w 32mm Diameter US $4.74
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 3 pcs 10mm Diamond coated tipped drill bits hole saw US $3.50
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 11mm GLASS Tile Granite Marble DIAMOND DRILL BIT US $6.84
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 NEW 1/8" 1/4" 3/8" 1/2" DIAMOND CORE DRILL BIT SET 4 US $36.99
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 NEW STAINED GLASS LAPIDARY 1/8" DIAMOND CORE DRILL BIT US $6.59
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 (4) 1mm JEWELRY BEACH SEA GLASS DIAMOND DRILL BITS US $7.44
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 3pcs (1/4") Diamond tipped drill bit hole US $5.09
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 1" Diamond Tile Glass Marble Hole Saw Drill bits US $10.20
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 1" DIAMOND COATED DRILL BIT for GLASS BLOCKS US $8.49
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 1/4" DIAMOND Core DRILL BITS Glass Fusing US $3.40
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 9 pieces set Diamond coated drill bit hole saw drills 11mm to 25mm US $13.99
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 85mm ( 3 3/8" inch) Diamond coated drill bit hole saw core drills with PILOT BIT US $16.50
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 4 Piece Diamond Coated Rotary Drill Bits US $10.95
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 1" DIAMOND COATED DRILL BIT GLASS BLOCK US $8.49
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 1/2" Diamond Tile Glass Marble Hole Saw Drill bits US $6.79
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 3pcs 10mm (3/8") Diamond coated drill bit bits hole saw US $3.50
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 3 DIAMOND DRILL BITS - Lapidary, ceramic, stained glass US $21.72
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 2 NEW STAINED GLASS JEWELRY 1/8" DIAMOND CORE DRILL BIT US $16.50
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 55mm Length Silver Tone 10mm Hole Saw Drill Bit Tool US $2.81
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 5pcs Diamond drill bit set ~ sea glass US $8.71
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 4 pcs 16mm Diamond coated drill bit bits hole saw 8002 US $12.99
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 4 pcs 20mm Diamond coated drill bit hole saw glass 8004 US $12.99
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 NEW STAINED GLASS LAPIDARY 1/2" DIAMOND CORE DRILL BIT US $14.99
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 Diamond Drill Bit Sea Glass Sampler SET 5 pieces US $8.50
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 4pcs. Diamond coated 25mm drill bit hole saw marb 8006 US $13.99
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What is the difference between diamond drill bits, hss drill bits, cobalt drill bits, etc?
I went to a store looking for some basic twist drill bits (someone told me to get them), and there are all these types, and I'm totally confused now.
The material you use depends on the surface you are drilling. The price increases as the bits' material gets harder and more heat resistant.
The cheapest is Low Carbon Steel drill bits. Those are only for softwood, and they dull fast nevertheless. Slightly better option is High Carbon Steel. HSS, which stands for High Speed Steel drill bits are a significant improvement and can be used on hardwood and metals. They are the ones most commonly used in household projects.
Titanium Coated Drill Bits are more expensive and are significantly harder, since the coating is a hard ceramic material.
Then there are Carbide Tipped Drill Bits. These are extremely hard, and don’t heat as fast, but on the con side they are brittle and could chip.
Cobalt bits are most commonly used for stainless steel.
Diamond Drill Bits are in a league of their own. They contain diamond particles which makes them the hardest. Unlike other material, diamond drill bits grind as opposed to cutting through. They are used on glass, ceramics, stones, etc…
There are many charts online that outline material’s specifics. Here is one example: http://drill-bits.blogspot.com/2008/04/drill-bits-material-from-carbon-steel.html
Hope this helps.
Good luck.
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