peru stable countersunk head screws - skinirritationsite.info
2018-10-18u2002·u2002At its tip there is a fixed guide which is inserted into the pre-drilled hole.This ensures a stable guidance of the drilling machine and precise working. The cutting edges cut the material and make space for the head of the screw.Cylinder head screws and hexagon head screws are flush with the surface of the workpiece.
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