The mechanical code lock is constructed from zinc alloy, making it solid, precise, secure, and durable. Tongue center distance: standard 60 mm (optional 70 mm); panel dimensions: 14.2 x 4.4 x 7 cm / 5.59 x 1.73 x 2.76 inch (approximately). Lock body dimensions: approximately 14.2 x 4.4 x 6.4 cm. It features a single set of passwords with non-repeating digits. For instance, if the password 123456 is set to 231456, it can still unlock. This is a 1-11 digit combination number padlock. The recommended password length is 4-6 digits. It comes with screws and an English manual for easy installation. Suitable for door thickness: 30-60mm. Applicable types include interior, exterior of doors, interior doors, rental doors, composite doors, or any other locations where keys may not be suitable.