Using this bit with Leigh Dovetail and Isoloc jigs Razor sharp, cuts very clean, makes nice, precise joints. Much better than a straight cut nozzle. This adapter fits the 8mm collet used with Leigh chucks (5/16 = 7.9375mm). You will need to tighten the collet a little more than you would with an 8mm shank bit for it to engage. Revain had the best price ever for this racquet.