Concrete screws are used to attach a lot of different things to concrete or block walls: electric outlet and switch boxes, pipe straps, signs, HVAC ducts, and hand railings, to name just a few. You probably have a few uses waiting for this in your basement right now. With this screw anchoring system, you simply drill the hole, then slide on the sleeve and drive the screw. The kit includes one each: 5/32ﾔ x 4-1/2ﾔ masonry bit, 3/16ﾔ x 4-1/2ﾔ masonry bit, #2 and #3 Phillips drive bit, hex-head Allen wrench, drill bit sleeve, drill bit holder, 5/16ﾔ hex-head screw setter, ﾼﾔ hex-head screw setter, and a carrying case. Made in USA.