4 PackLarge capacity key lock box enables secure storage of up to five keys; fits most ball biscuit, and tulip door knob stylesSet your own alpha/numeric combination lock box; reset the combination for multiple personalized combination code optionsFor 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 buttonsExterior dimensions: 4-5/8 in. (11.7 cm) H x 3-1/8 in. (7.9 cm) W x 2-1/16 D (5.2 cm); 13/32 in. (10 mm) diameter shackle with 1-5/6 in. (47 mm) L, 1-13/32 in. (36 mm) WInternal Dimensions: 3-1/2in (89mm) H x 2-1/4in (57mm) W x 1in (25mm) D. Note : Refer to the PDF attached below in Technical Specification for User Manual