5/16-18 X 8" NC Tap HS Extra Long Plug Pulley Hand Tap.

These are new old stock . Yours will be the one in the pictures 

DESCRIPTION

NEW High Quality 5/16-18 x 7.75” NC OAL 7.75" HSS 4 flute plug hand tap in ground thread high speed steel.

Designed for cleaning up existing threads in low tensile metals such as metals mild steel, brass, aluminum and plastic . This tap is not intended for cutting or starting new threads