Features: Mechanical Code Lock&Nbsp;Has Good Performance High Quality Alloy Lock Shell,And The Overall Is Made Of Premium Alloy For Durability Through The Special Cold Rail Processing Completely, Harden Casting ChromePlated Surface, Exquisite Workmanship, Durable More Effective Against Violent Destruction Specification: Panel Material: Zinc Alloy Password Length :4-7 Bits Lock Body Material: Steel Plus Zinc Apply Thick Door: 30 60 Mm Color: Silver Applicable Type: Indoor, Outdoor Door Features: Waterproof, No Battery Power Center Distance Of Locking Tongue :60M Weight: 1439 G / 50.8 Oz(Approx.) Package List: 2 * Lock Body 1 * Box 1 * Installation Accessories 2 * Lock Pad 1 * Lock Tongue 1 * Password Card 1 * Instruction &Nbsp; Note: The Password Is Not In Order, The Number Can Not Be Repeated. Please Use The Password Card Or Change The Password Before Use. Take The Front Panel And The Back Four Screws. Take Off The Cover Plate, Hold Down The C Key And Take Out The Password Chip With Tweezers. Loosen The C Key If It Cannot Be Taken Out.For NonPassword Key, Put The Stainless Copper Password Key Into The Slot That You Want To Set As The Password, And Bronze Into The Slot That Does Not Set The Password.