The RCBS collet bullet puller is designed for Used in large reloading presses that accept 1-1/2"-12 threaded dies. It is made to pull the bullets from loaded ammunition for the 416 Barrett or 50 BMG with the use of special collets (sold separately). Specifications: - Fits: 1-1/2"-12 threaded presses - function: collet bullet puller for large cases - Material: Steel.