Core Drill Bit

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Features: Cuts holes in glass quickly & easily Use with drill press or hand drill Spray diamonds with water to keep cool while drilling Use press-release-press-release action to mi nimize heat & allow coolant to flush away debris All Bits: 70mm overall length, 30mm shank length 1/8” Diamond Core Drill: 4mm (.16”) outside diameter, 4mm shank diameter. 1/4” Diamond Core Drill: 6mm (.24”) outside diameter, 6mm shank diameter. 1/2” Diamond Core Drill: 12mm (.47”) outside diameter, 8mm shank diameter. 3/4” Diamond Core Drill: 18mm (.71”) outside diameter, 8mm shank diameter. 1” Diamond Core Drill: 25mm (.98”) outside diameter, 12mm shank diameter. 1-1/4” Diamond Core Drill: 32mm (1.26") outside diameter, 12mm shank diameter. 2” Diamond Core Drill: 40mm (1.97") outside diameter, 12mm shank diameter. Show more