1" X 7/16" Pilots for Counterbore Quantity:1 Drill Size: 15/64"

Drill Size: 15/64"

Tekton 1/2 inch drive shallow external star (E-Star) sockets are made from 50BV30 steel that's hardened to 40–47 HRC for strength and durability

Part Number DWTSMR212-38X3

Part Number DWDBL29/64

Tap Drill Size 1-1/64"

1" X 7/16" Pilots for Counterbore Quantity:1 Drill Size: 15/64"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