Description 5/16″ Carbide Tip Straight Bit Every Leigh dovetail jig is shipped with 8mm shank router bits. They are considerably stronger and stiffer than 1/4″ shanks, allowing smoother cuts and faster feed rates with a greater margin of safety. Routers with 8mm or 1/2″ collets are required to use 8mm shank bits. A Leigh 1/2″ to 8mm collet reducer, supplied with all Leigh dovetail jigs, allows 8mm shank bits to be used in 1/2″ collet routers. Included with D4R Pro
