Upper and Lower Vice Block Set

The upper and a lower vice block are made of solvent-resistant polymer construction and the lower receiver fits into magazine housing from either top or bottom. The upper and lower Polymer Vise Block Kit features a magazine catch that securely locks the receiver to the block and will not crush, distort, mar or damage the receiver. The Hana World's upper & lower vise block set is excellent for cleaning, repair, service, or assembly of a weapon. Features:  Allows safe mounting of the lower receiver into a vise Will not crush, distort, mar or damage the receiver Constructs of light, solid weight glass filled polymer Black finish  High strength and light weight  Upper vise length 4.5in. Lower vise length 4.9in. Compatible with: All AR-15 and M16 Uppers (A1, A2, A3, A4) All firearms that use AR-15 uppers Might work with similar uppers