Star-M Auger Drill Bit Extended Length 508mm x 25mm (1") 4L Series

Star-M is a Japanese precision tool brand renowned for manufacturing the world's finest auger drill bits for woodworking, joinery, and timber construction. Star-M auger bits are machined to exceptional tolerances, featuring precision-ground lead screws and cutting spurs that produce clean, accurate holes in timber with minimal tear-out — trusted by carpenters and joiners worldwide.

Star-M auger drill bits are available across multiple series — 4S (standard), 4L (extended length), 6, 8M (hardwood), and 8L (extended hardwood) — to cover joinery, framing, hardwood drilling, and deep boring applications in timber.

Where this product is used

Star-M auger bits are used by carpenters, joiners, cabinet makers, and timber frame contractors requiring precision holes in timber.

• Joinery and cabinet making requiring clean, accurate holes in hardwood and softwood
• Timber frame construction and framing where deep boring and clean entry holes are needed
• Post, beam, and structural timber work where hole diameter and accuracy are critical

Key specifications

Selecting the right option

Select the Star-M series based on the material and bore depth required: 4S for standard softwood applications; 4L for extended-reach framing and through-boring; 8M and 8L series for hardwood where the reinforced, hardened geometry maintains performance. Match the diameter to the fastener, dowel, or service requirement. Packs of 50 offer best value for production environments.