Product: Glass Core Drill with Center Pilot Bit 

Shank Type: Round Shank Grit Size: 70/80# 

Overall Length: 55 mm 

Sizes: 20mm‑120mm 

Manufacturing Process: Electroplated 

Description:This diamond core drill is specially designed for drilling brittle building materials such as glass and tiles. Equipped with a center pilot bit, it enables operators with little working experience to lock the drilling position firmly and effectively prevent bit slipping and wandering. Once positioning is completed, remove the pilot bit, then proceed with smooth hole‑cutting. It delivers effortless drilling performance and is user‑friendly even for beginners.