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Features:In one step, you can drill, countersink and counterbore the perfect sized hole for #5, #6, #7, #8, #9, 10# or #12 screws.Drilling hole depth can be adjusted by loosening and tightening the stop collars. Ideal for plugs or dowel buttons. Works with all types of wood/lumber.Sizes:#5, #6, #7, #8, #9, #10 and #12Bit sizes: 1/8", 9/64, 5/32, 11/64, 3/16, 13/64, & 7/32 inchAllen Wrench: 3/32" diameter.USAGE SUGGESTION:To avoid countersink drill bits become overheated and get burned up due to fast rotary friction,we suggest customers to use cutting fluid to keep the bits cold during usage.Package includes:4 x Countersink Drill Bits1 x Allen Wrench1 x Storage case