1-3/4" X 7/16" Pilot Hole HSS Taper Shank Counterbore Shopify Collective Size 5/16"-20

Size 5/16"-20

4 flute carbide tipped glass and tile drill bit improves speed

Internal Diameter: M14-1

Part Number: Assortment Kit #573

resulting in a tool that's higher performing and more durable than traditional one-piece designs

1-3/4" X 7/16" Pilot Hole HSS Taper Shank Counterbore Shopify Collective Size 5/16"-20Product 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