Schlosser Technik Outdoor Combination Wall Mounted Key Holder Safe The Schlosser Technik Key Keeper provides a secure storage option for spare house and car keys, ideal for ensuring that you don't get locked out again when you lose or forget your keys. Key Measurements &Information Internal dimensions: 72mm x 38mm x 22mm High quality cast zinc alloy construction. White tinted numbers for visibility in dark areas. Complete with instructions for fitting.