21/32" X 3/16" Pilot Hole HSS Straight Shank Counterbore Quantity:1 Part Number BRCF351

Part Number BRCF351

Left hand jobber drills are for general purpose drill construction and feature a left hand helix for screw machine applications where spindles rotate counter-clockwise

Part Number: 100C600WASS

Part Number DWTB1-3/8-12

Part Number: 62C300ASBABO

21/32" X 3/16" Pilot Hole HSS Straight Shank Counterbore Quantity:1 Part Number BRCF351Product 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