1-3/8", Rabbeting Bit, Make Strong Lap Joints, Cut Recesses To Let In The Back Panels Of Cabinets, Or Create An Interesting Detail On Built-Up Molding, Produces Super Smooth Cuts On Both Surfaces Of The Rabbet, Interchanging Bearings AllowCreation Of Many Different Rabbet Depths With A Single Bit, Use In Hand-Held Or Table-Mounted Routers To Cut Hard Or Soft Wood, Plywood Or Composite Material.