Stack-On"s SPAPR-4 4 Position Pistol Rack is a uniquely designed pistol rack that allows for quick and easy access of handguns. Multiple units of the SPAPR-4 can be stacked on top of each other to accommodate more handguns. There are 2 steel stacking supports that are included with each pistol rack. This rack is made of tough ABS materials with snap-fit construction. Works great inside of safes and security cabinets.