Drillpro 7pcs 5-10mm Countersunk Drill Bit Countersink Metal Woodworking Tool
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Nice packaging, drills produce a clean, smooth countersink. I didn't try them on harder wood but I don't think there will be a problem, they feel really sturdy
Looks good, there's no test yet.
Excellent set of quality countersinks
Very good 90 deg drills, in small PE cases for protecting