CRL Plated Diamond Flat-Tip Drills are to be used in hand-held rotary tools or small precision drill presses. Diamond is plated on flexible music wire. Triple-Ripple Drills have twice the life and cutting rate of our Flat-Tip Drills. The Triple-Ripple Diamond Drill has three flutes to allow cuttings to flush away, and decrease frontal contact and drag. As the edges wear, fresh diamond in the flutes maintain the cutting action. NOTE: Always submerge in CRL Diamond Tool Coolant solution to prevent overheating and prolong long life.