HHIP 3900-5276 ER-40 Spring Collet, 3/8"
ER-40 3/8" Spring Collet ~ Made of high grade tool steel. ~ Hardened and precision ground. ~ Meets or exceeds Federal specifications. ~ Major diameter is 1.620". ~ Overall length is 1.810". ~ Collet must be placed into collet chuck nut before inserting into collet chuck.