CRL 5/8" HBT Belgian-Thread Electroformed Diamond Drill Bit for Glass

• For fast cutting, high-production glass drilling
• Extended work life with multi-layer electro-formed diamond
• Two mounting styles: Straight shank or Belgian type (1/2" gas thread)

These CRL Electro-Formed Diamond Drills are thin-walled, with a 1/2" (12.7 mm) deep multi-layer of diamonds and bonding matrix engineered for high-speed, high-production drilling of flat (plate) glass. Designed for precision drilling presses, these bits deliver outstanding results when operated under recommended conditions. The CRL DCD Series uses an extra-long 1-3/8" x 3/8" (35 x 9.5 mm) diameter shank for a positive grip. The CRL HBT Series (SKU: HBT58) features Belgian-style mounting threads — a common choice for U.S. and European glass drilling machines.


Because these electro-formed drills have very thin walls, they are EXTREMELY FRAGILE and must be used only in precision machines. Always drill on flat surfaces with minimal pressure. Sharpening or "dressing" the bit before each use significantly improves cutting performance; a dressing stone is recommended for electro-formed diamond drills.

IMPORTANT NOTE: CRL DCD and HBT Series Diamond Drills are intended for drilling flat plate glass ONLY, in a true running production drilling press.

NEVER perform freehand drilling. If using a hand drill, stabilize the bit with a base such as the GDB1 or GDB2 Glass Drilling Bases. Improper use can damage the bit and void the warranty.

Always wear proper safety gear (gloves and eye protection) and work on a flat, horizontal surface. Use a Ground Fault Circuit Interrupter (GFCI) whenever electric tools are used with water or coolant to reduce the risk of injury.

Shop CRL HBT58 electro-formed diamond drill bits for precision flat glass drilling — order now.