BTM’s Lit-L-Loc units are an economical approach to fastening sheet metal assemblies with a small upstanding flange. BTM can configure Lit-L-Loc units to join a range of metal thicknesses or optimize them for a specific thickness. For increased flexibility, the punch and die can be reversed in these units, allowing the Tog-L-Loc^® “button” to form in either direction. Lit-L-Loc units can be ordered individually, or as part of a complete kit which includes a pressure booster which converts shop air into hydraulic forces, and an 80 inch [2 meter] hose assembly.