31/32" X 5/16" Pilot Hole HSS Straight Shank Counterbore Quantity:1 Part Number: 75C1000SHB307Z

Part Number: 75C1000SHB307Z

Part Number DWDTS31/64-1MT

Thread Size: M4-0

Part Number DEWCHAT1-1/2-90

Left hand jobber drill bits are for general purpose construction

31/32" X 5/16" Pilot Hole HSS Straight Shank Counterbore Quantity:1 Part Number: 75C1000SHB307ZProduct 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