1/4" Surface Drive x 12mm Standard Universal GRE912UMS transmission jacks Constructed of tubular aluminum

Constructed of tubular aluminum

High speed steel drill bits have black body and goldtone flute that stays sharp longer

Also mounts test indicators with 1/4" post

Wrench rests snugly against the center hole

1/4" Surface Drive x 12mm Standard Universal GRE912UMS transmission jacks Constructed of tubular aluminum1 4" Surface Drive x 12mm Standard Universal Features and Benefits Made of high quality steel (chrome molybdenum); thorough and exact heat treatment insures the correct balance of strength and durability Engineered specifically for use with impact tools, using the most up to date industrial specifications Made to transfer the pressure from the thinnest part of the socket wall toward the thicker section, resulting in increased strength Allows up to 20%