Master Lock 5400T Set Your Own Combination Portable Lock Box, 5 Key Capacity, 2 Pack Set Your Own Combination Set your own four digit combination for keyless convenience and increased security. Portable Design Removable shackle for easy ?over the knob? installation. Protective weather cover allows for use outside, while preventing dials from freezing and jamming. Molded body and vinyl coated shackle prevent scratching of door. Large Capacity Large internal capacity will accommodate up to five keys. Best used for house keys or access cards. Note: the internal dimensions are shaped like an "L." The top section measures 0.3 in. x 1.56 in. x 2.95 in. and the bottom section measures 0.95 in. x 1.51 in. x 3.21 in. The Master Lock 5400T Lock Box, Resettable Combination Dials (Two Pack) features a 3-1/4 in. (83 mm.) wide metal body for durability. Portable lock box design offers removable "over the knob" installation. Set your own four-digit combination for keyless convenience and increased security. Lock box includes a shutter door which protects combination dials from weather, dirt and grime; and molded body and vinyl coated shackle prevent scratching. Master Lock's Lifetime Guarantee provides peace of mind from a brand you can trust. Large capacity key lock box enables secure storage of up to five keys; Fits most ball, biscuit, and tulip door knob styles Set your own four-digit combination lock box; Reset the combination for thousands of 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 shutter door to protect combination dials from weather Measurements: Exterior dimensions: 6-1/4 in. (16 cm.) height, 3-1/4 in. (8.3 cm.) width, 1-1/2 in. (38 mm.) depth; Interior dimensions: 3-1/2 in. (8.9 cm.) height, 2-3/4 in. (7 cm.) width, 1 in. (25 mm.) depth; Lock box shackle is 1-13/32 in. (36 mm.) long, with 1-7/8 in. (48 mm.) width, 13/32 in. (10 mm.) shackle diameter Includes two portable combination lock boxes