LOCK BOX APPLICATION: For indoor or outdoor use; small portable lock box is best used for key storage; Recommended for 1-2 keys for a house or car Set your own alpha/numeric combination lock box; Reset the combination for multiple personalized combination code options For indoor and outdoor use; Key safe is constructed with a metal body for durability, vinyl coated shackle to prevent scratching, and weather cover to protect combination buttons SPECIFICATIONS: External Dimensions: 5.25in (133.35 mm) H x 2.75in (70mm) W x 1.50in (38mm) D Internal Dimensions: 1in (25mm) H x 2.25in (57mm) W x 0.50 in (12.7mm) D Shackle Length: 1.406 in (36mm) Shackle Width: 1.875 in (48mm) Shackle Diameter: .406 in (10.31mm)