1-3/16" X 5/16" Pilot Hole HSS Straight Shank Counterbore Quantity:1 Part Number DWCF918

Part Number DWCF918

Part Number DEWA4006

Part Number DWT54966

200x - M12SFWA2 - M12 Stainless Steel A2 Flat Washers

Their extended length allows the deep socket to fit over long fasteners and reach into recessed areas

1-3/16" X 5/16" Pilot Hole HSS Straight Shank Counterbore Quantity:1 Part Number DWCF918Product Description Counterboring is the enlargement of a portion of a hole that has previously been formed. If the counterbored portion is shallow (1 8" or less), the operations is usually known as spot facing; for example, a flat seat for a bolt head or nut. If, on the other hand, the hole is enlarged to a considerable depth, it is designated as counterboring. These counterbores are made of two piece construction, having an integral shank and