CRL 2-1/4" PD Series Metal Bond Diamond Drill Caulking & Urethane Heaters/Coolers Overall length is 15-3/8" (391

Overall length is 15-3/8" (391 mm)

They are tapered on each end for use in six different joint widths

Thickness is 6 mils

It is not intended for that function

It goes on smooth and evenly

CRL 2-1/4" PD Series Metal Bond Diamond Drill Caulking & Urethane Heaters/Coolers Overall length is 15-3/8" (391Straight Shank and Belgian Thread Type 3 8" Diamond Matrix Depth Two Mounting Styles to Choose From: Straight Shank or Belgian Thread PD Features 3 8" x 1 3 8" (10 x 35 mm) Shaft CRL PD and PDT Series Metal Bond Diamond Drills use a special diamond and brass bond for maximum performance in glass. Metal Bond Drills offer the longest life of any type of diamond drill; 1000 to 2000 holes in 1 4" (6 mm) glass with proper maintenance and the use of a wet