12'' (305 mm) Arbour Extender 31678 Extends hole saws and other drill bits. 118° split-point pilot bit. Hardened mandrels for long thread life. Note: Set pilot drill point 1/8'' (3 mm) beyond tooth points. Buy Now Find Retailer Product Media Specifications Warnings Related Items Downloads Brochure Images High-Res JPG 31678_photo.jpg PNG 31678.png The arbour extender extends hole saws and other drill bits. The hardened mandrels provide long thread life. Note: Set pilot drill point 1/8'' (3 mm) beyond tool points. Specifications Shank Size: 7/16'' (11 mm) UPC: 092644316784 Additional Information Warranty Compliance Warnings Always wear approved eye protection. Never use on or near live electrical circuits. Read and follow safety instructions in power tool owners manual. Related Items 31905 Hole Saw Arbour with Adaptor, 35 mm 31906 Hole Saw Arbour with Pins - 11 mm