This matched stile and rail bit set is factory set to guarantee a perfect fitting joint every time. Features a bearing-guided design that helps to eliminate dips and ensures a smooth, burn-free cut. Slot cutter can be easily removed. 1-5/8" overall diameter x 1" cutting length x 1/2" shank. 1-1/2" shank length. 5/8" bearing. Groove is 3/8" D x 1/4"H. For an easy way to set the bit height with perfect repeatability, try our Router Bit Set-Up Jig (53803, sold separately).