15/32" X 3/16" Pilot Hole HSS Straight Shank Counterbore BoltsandNuts.com and general aviation work •

and general aviation work • 12-Point Shallow Sockets and 90-Tooth Ratchet – Includes 5/32 - 9/16 inch and 4 - 15 mm sockets and 90-tooth non-quick-release ratchet • 1/4 Inch Bits and 72-Tooth Bit Ratchet – Includes 3/16 - 5/16 inch (slotted)

Radiused corners prevent damage to a spark plug by applying force to the flat sides

and other materials

Size 3/8"-#22

15/32" X 3/16" Pilot Hole HSS Straight Shank Counterbore BoltsandNuts.com and general aviation work •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