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

Flute Length 1-5/16"

4 flute carbide tipped glass and tile drill bit improves speed

Part Number: 100C900HCS8Y

Each Tekton ratcheting flex head wrench is permanently marked with both a high-visibility laser marking and a stamped marking for easy size identification

Size 5/16"-20

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