Sealey Worksafe HSS Twist Drill Bit

The Sealey Worksafe HSS Twist Drill Bit Ø8.5mm offers a specialist intermediate diameter for precision large-hole applications. Supplied as a single drill bit, the 8.5mm size is frequently required for pilot holes before tapping M10 and M12 threads, reaming operations, and applications where standard 8mm or 9mm sizes don't provide the exact clearance needed. This size is particularly valuable in heavy engineering, automotive repair, and machinery maintenance where specific tolerances are critical for proper thread formation and component assembly. Features and Benefits: • 8