Aim Sports ATLVB AR Lower Vice Block Black Polymer This vise block allows for safe mounting of the lower receiver into a vise. It is ideal for cleaning , service, or weaponry assembly, and fits into the magazine housing from either the top or bottom. Type: Vise Block Material: Polymer Dimensions: 4.9" Gun Type: AR-Style Rifles Gun Model: AR-15 Weight: 4.3 oz No. of Pieces: 1