CRL 1-1/8" PDT Belgian Series Metal Bond Diamond Drill Glass Abrasive Tools There are center reference marks

There are center reference marks inscribed on the outside of the drill housing for easy lineup of your holes

and also used by the auto glass industry for windshields

Use with DTC80 Diamond Tool Coolant and submerge in a retaining ring for best results

Some applications include auto glass fabrication

A Dressing Stone is a recommended necessity when working with an Electro-Formed Diamond Drill

CRL 1-1/8" PDT Belgian Series Metal Bond Diamond Drill Glass Abrasive Tools There are center reference marksDesigned for High Volume Glass Fabrication 3 8" Diamond Matrix Depth Two Mounting Styles to Choose from, Straight Shank or Belgian Thread 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; 1,000 to 2,000 holes in 1 4" (6. 4 mm) glass with proper maintenance and the use of a wet Sharpening Stone to expose fresh