Uxcell a14010600ux0134 6.5" Long Collet Chuck Wrench Spanner for ER20 Clamping Nut Product Name : Collet Chuck Wrench; Type : Single Ends, Round Opening fit For : for ER20 Clamping Nut;Material : Metal Opening Width : 30mm/ 1.2" (Side to Side);Total Size : 165 x 62 x 6mm/ 6.5" x 2.4" x 0.24" (L*W*T)