Alvin D. SI
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[주문접수]카운터싱크워셔(Countersunk Washers) : 네이버 카페

Lee Valley's new Countersunk Washers solve the problem of screw heads splitting stock. The washer/screw combination applies force the same way a pan-head screw does, but is counterbored to a flush position. They're availabe in brass or stainless steel, in