11/16" X 3/16" Pilot Hole HSS Taper Shank Counterbore Shopify Collective Part Number: VibraTite1501Liter

Part Number: VibraTite1501Liter

Part Number DMODU

These drill bits have a 1/2" reduce shank

Part Number: 31C225ASBSS

Part Number DWT54332

11/16" X 3/16" Pilot Hole HSS Taper Shank Counterbore Shopify Collective Part Number: VibraTite1501LiterProduct 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