Description MANUFACTURER: Rim Crinkle Diamond 12mm= 1/2” x 2-1/16” (12mm x 5.3cm) These crinkled diamond core drills are used on stone and glass, and making holes in clock faces and wine for lamps. Crinkled edges quickly removes debris for more diamond cutting surface contact. Crinkle drills are nickel electroplated with premium #100 diamond grit.
