Description:

Hole Diameter: 3/16 in (5 mm). Core Diameter: 1/16 in (1.6 mm). Shank Diameter: 5/16 in (8 mm). Overall Length: 2-1/4 in (57.4 mm). Drilling Depth: 1 in (25.4 mm). Heavier and deeper layer of diamond coating and notches in the core allow to drill up to 200 holes in 1/4" thick flat glass. Diamond drills must always be used at a proper speed with suitable diamond coolant applied by spraying or submerging the contact area. Use of plain water will drastically reduce life of your drill..