Tungsten steel drill bit with hard coating 7 handle HRC55 degree spring protection tungsten steel engraving machine CNC drilling machine alloy end milling tool
Drill bit for steel 6 1*7 shank*73 length*3 times diameter blade Long steel drill bit 6 2*7 shank*73 length*3 times diameter blade Long steel drill bit 6 3*7 handle*73 length*3 times diameter blade long
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