9/16" X 3/16" Pilots for Counterbore Quantity:1 Part Number: Assortment Kit #143540

Part Number: Assortment Kit #143540 Pieces - Fine Thread

Tap Drill Size 13/16"

• Comfort Grip Handle – We designed our comfort grip handle with a rounded oval shape to fit your hand without being bulky

Grade 8 Lock Washers Zinc Yellow

9/16" X 3/16" Pilots for Counterbore Quantity:1 Part Number: Assortment Kit #143540Product 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