In one step, you can drill, countersink, and counterbore the perfect sized hole for #4, #6, #8, #10, or #12 screws. Replacement bits are without countersinks. Counterbores are 1/4" dia. Ideal for plugs or dowel buttons 1/4" hex shank can be used with power drills and quick change chucks

Features:
• Counterbores are 1/4" dia.
• Ideal for plugs or dowel buttons
• 1/4" hex shank can be used with power drills and quick change chucks