Feature: This wood drill bit is used for pre-drills holes and countersinks, reducing the risk of splitting the panel, and can be covered nicely with wooden plugs. Suggestion: To avoid countersink drill bits overheated due to fast rotary friction, we suggest that using cutting fluid to keep the bits cold during usage. Only for drilling screw holes in wood and plastic, not steel material Apply to clamping head or joint drilling machine. Size: 5#(1/8 inch,3mm) 6#(9/64 inch,3.5mm) 7#(5/32 inch,4mm) 8#(11/64 inch,4.3mm) 9#(3/16 inch,4.7mm) 10#(13/64 inch,5.2mm) 12#(7/32 inch,5.5mm) Allen Wrench: 3/32 inch Package: 7 x Countersink Drill Bits (7 Sizes) 1 x Allen Wrench 1 x Plastic Storage Case
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