HHIP 3900-5191 ER-20 Spring Collet, 1/2"
ER-20 1/2" Spring Collet ~ Collet has a range of .472-.511. ~ Made of high grade tool steel. ~ Hardened and precision ground. ~ Meets or exceeds Federal specifications. ~ Major diameter is .830". ~ Overall length is 1.230". ~ Collet must be placed into collet chuck nut before inserting into collet chuck.