22-piece HHS4241 Tapered Wood Screw Countersink Wood Drill Bit , #5, #6, #7, #8, #9, #10, #12 100% Brand New and High quanlity Suitable for drilling in hard wood and wood floor The adjustable stop collar allows you to either set the screw head flush with the surface or drill a Tapered drill sizes: #5 - 1/8 Meterial : High speed steel 4241 , Shank meterial : 45# steel .