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6pcs countersink set drill bits for drilling holes with screw sizes 5#, 6#, 8#, 10# and 12#. 8pcs Standard Wood Plug Cutter Set includes 4 standard plug cutters and 4 four-tooth chamfered cutters.1/4’(wood plug 6mm),3/8’(wood plug 10mm),1/2’(wood plug 13mm),5/8’(wood plug 16mm). Countersink drill set are easy to use and adjustable for length with hex wrench. Through quenching treatment, the hardness is improved, and sufficient torque is guaranteed to be stable and not slippery. Perfect for doing home improvement, DIY and general engineering use.Works with most types of hand drills. Including but not limited to Electric hand drill,Lithium electric drill,Pillar drill.