Kreg jig r3, doweling easily join materials from 1/2″ to 11/2″ thick 12-38 mm in 1/8″ 3 mm increments, positioning sliders allow you to easily adjust within 9 depth settings, dual wood chip holes keep drill bit clear of excess wood chips, 2 hardened steel drill bit guides feature a lifetime warranty, depth collar gauge is molded into the case for handy reference, easily attaches to any kreg face clamp, bar clamp, or c-clamp, build bookcases, shelves & storage projects for your home, great for creating custom built-ins & countless other home improvement projects, can be used portably to make lasting repairs around your home.