Stack-On GCG-900 Steel Pistol / Ammo Cabinet is a California approved firearms safety device that meets the requirements of California Penal Code Section 12088 and the regulations issued thereunder. The locking mechanism passes through steel door and is secured behind the steel door frame for added security. The GCG-900 unit is fully lockable with key coded, double-bitted lock. This cabinet includes 2 removable shelves and a foam padded bottom. The pre-drilled mounting holes allow for easy attachment to floor, ceiling, wall or other Stack-On pre-assembled gun cabinets. Both the Stack-On GCG-900 and Stack-On GCB-900 fit on top of all standard pre-assembled Stack-On Security Plus Gun Cabinets. Not recommended for use with Stack-On 10 Gun Security Cabinet or 8 Gun RTA Cabinet.