Feature: 7/8" cylinders fit up to Installation thickness 5/8" (about 15mm), Please see the picture for details. The initial unlock password: 3 Wheel Dial Set To 0-0-0, It can be reset as you like. Ideal for Letter box, drawer cabinet, metal cabinet, office cabinet, school lockers or any where keys are not suitable! Note: This Item not suitable for double door cabinets. How to change your password? There is a hole behind the lock. In the unlocked state, Using a small stick to press the hole and then choose your new password at the same time. Finally release the stick and your password changed. Please allow 1-5mm difference due to manual measurement. Why can't the lock rotate? When the Item Cross the ocean and delivered to your hand, the password may be correct, but it cannot be rotated. Please don't worry, just pull the 3-digit password to the left and right, then set back to 000, then hold the handle (see picture 4) and force it to rotate right.(maybe use a little force) Everything is fine Specification: Color: Silver Black 90 Degree Turn Material: Zinc Alloy Length (from back of lock to end of lock body): 20mm Length inc. Cam: 23mm Across flats: 16mm Body Diameter: 19mm Face Depth: 17mm Face Diameter: 38mm Overall length: 44mm To centre of lock: 34mm More detailed,please see photo, Quantity:1 Pc, Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 Pc x Mailbox Lock .