Centre drill set in plastic box consisting out of 5 A217 centre drlls with a 82° straight conical form, double ended and cylindrical body, sizes 1 to 5 , according to ANSI standard to produce form A centre holes or starting pilot and conical seat for US standard countersunk-head screws, HSS and bright finish for machining free machining, plain carbon and alloy steel and grey cast-iron
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