1-3/16" X 5/16" Pilot Hole HSS Straight Shank Counterbore Quantity:1 and 1/2 inch drive accessories

and 1/2 inch drive accessories have a spring-loaded ball detent that lightly secures the socket by engaging its through hole

Size #4-36

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

Part Number DWTB1-1/2-12

High speed steel corner rounding end mills are designed to create rounded edges on workpieces

1-3/16" X 5/16" Pilot Hole HSS Straight Shank Counterbore Quantity:1 and 1/2 inch drive accessoriesProduct 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