UMAI 4-Digit Code Combination Heavy Duty Door Lock | Number Lock | Portable Luggage Lock | Travel Lock for Briefcase, Laptop Bags(Pack of 1) (Blue) STURDY AND DURABLE: Made of high-quality Zinc Alloy material, our Heavy duty combination lock is corrosion-resistant and designed to withstand all weathers conditions indoor and outdoor. MODERN AND SLEEK DESIGN: The lock measures 84MM(L)*43MM(W)*21MM(H) with a total body height of 48MM including a shackle of diameter 6MM, making it an easy and secure fit to your luggage or briefcases. 4-DIGIT COMBINATION SYSTEM: Our lock offers a high level of security by allowing the user to set a unique 4-digit code which can be reprogrammed making it a versatile security option hard to tamper with. LONG LASTING: The lock is designed to withstand repeated use over an extended period of time as it can be unlocked over more than 20,000 times providing reliable security for a long time. MULTIPURPOSE USAGE: UMAI locks can be used in a variety of settings, such as securing luggage, backpacks, briefcases, lockers, both indoors and outdoors utilization. EASY TO SET: Our locks comes with a number lock flip-and-set mechanism for hassle-free use.Eliminate the need to carry a key, which can be lost or misplaced. INSTRUCTIONS TO SET COMBINATION: 1. Align the dials to exactly 0-0-0-0, pull the shackle to open & rotate 90 degree counterclockwise. 2. Press down the shackle to make small hook on bottom of shackle to enter into the hole, rotate another 90 degree counterclockwise to hold on the hook. 3. Set your combination, rotate & pull up the shackle back to lock, scramble the dials.