Aluminum fixture securely cradles bolt and prevents flying parts. Threaded steel shank captures and compresses ejector spring and aligns roll pin for easy removal with punch, loosens gradually to relieve spring tension. Works equally well for bolt assembly. Compact and light enough to take to the field. A must for all AR shooters. Mfg: Young Mfg SPECS: Aluminum, black anodized base. Steel shank. 4" (10.2 cm) long, 11/4" (3.2 cm) wide. 8 oz. (230 g) wt.