The Stack-on Handgun / Ammo steel cabinets are secured with a large steel cam that pass through the door and then behind the steel cabinet frame. Opens with a double-bitted, key-coded cylinder lock. 2 removable shelf (shelves) are included for greater storage and organization. Exteriors have a high gloss powder paint finish with chrome or gold accents. Both the GCG-900 (green) and GCB-900 (black) fit on top of all standard factory assembled Gun Cabinets. Pre-drilled mounting holes and fastening hardware are included. Not recommended for use with Stack-On 10-Gun Security Cabinet or 8-Gun RTA Cabinet. California-approved Firearm Safety Devices and meet the requirements of Penal Code section 23655 and the regulations issued thereunder.