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Whittemore-Durgin Stained Glass Supplies
825 Market St., Rockland MA 02370
Phone: 781-871-1790  Toll-free: 800-262-1790
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Diamond Tech 1/4" Core Drill Bit

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Diamond Tech 1/4" Core Drill Bit
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Item no: 6975D
Diamond Tech item: 38
Retail price: $20.36 /each
3 or more $18.32 (10% discount)
6 or more $16.29 (20% discount)
In stock:  5  (units: each)

Shaft Size: 3/8" (10mm)
Diameter: 1/4" (6.35mm)

Diamond drills are used to drill holes in glass, mirrors, ceramic, tile, slate, plastic, fiberglass, stones, or pottery.

They are made by diamond coating one end of a solid rod (wire drills) or hollow tube (core drills). They work with a standard electric drill, drill press or rotary tool (like a Dremel). However, unlike standard drill bits that simply cut a hole, wire drills and core drills work by gently grinding the glass to remove a complete circle. 

This process takes time; be patient. You should not use full power when drilling holes in glass, otherwise you might heat up the glass too much and crack it. Remember, you are not so much drilling as you are slowly grinding or carving some of the glass away. 

Tip: Start your drilling at a 45 degree angle to the glass, then gradually bring your drill up to the more conventional 90 degrees.

You must keep the glass cool; try spraying it with water often, or drilling against a wet sponge. You can also keep water on your drilling surface by using glazing compound or putty to create a sort of dam around it, to ensure the water stays in place.