Recommended series of key padlocks: industrial-grade brass padlock series, gallless mille-feuille lock series
 
Recommended models for combination padlocks: 4680DNKL, 175MCND, 1523MCND
 
Master is arguably the most powerful padlock brand in the United States, and you can hardly find anything other than Master on Amazon's sales list of key padlocks and combination padlocks. Master's founder, Harry Soref, was the first to design laminated steel layers padlocks, which use multiple thin steel plates riveted together to make a strong lock body, which is stronger than the general solid steel lock body structure and can withstand strong external impacts, and this type of padlock is still sold by Master today. In 1931, Sorev received the only gold medal from the American Society of Master Locksmiths for his great contribution to the lock industry.
 
Master has a long history of lockmaking, whether it is industrial equipment security or commercial locks, there are complete product layouts. As far as commercial locks are concerned, the combination lock design is diverse, and the lock beam has two kinds of metal lock beams and braided steel cables, and the braided steel cable lock beams have a high degree of flexibility, such as the 4603D equipped with telescopic steel cables, which can hang two objects that are close to each other at the same time. TSA customs lock 4680DNKL and 4688D are equipped with these two kinds of lock beams respectively, in addition to a variety of other models, shapes, more choices than other brands, the price is mostly around 40 yuan. The 4697 series TSA customs lock needs to be set with a 4-digit password, and there are two options for numeric and alphabetic password plates, and the price is nearly 80 yuan. TSA customs locks are mainly designed for people who often travel abroad and do business offices, and the lock body of the combination lock also has a keyhole and is printed with a number, which is convenient for customs inspection and avoids violent locking.
 
In addition to the common semi-hidden digital turntable, there are also clock-type disc passwords, direction passwords and alphabetic passwords, etc., wherein, the password disc of the fixed combination lock is designed to be similar to the turntable of the safe, and the fixed password of the three digits needs to be unlocked by turning the turntable counterclockwise, and the operation is more complicated than the general combination lock. The directional password lock is set by the four directions of the upper and lower left and right, and the number of 1500iD password digits is unlimited, while the higher price of 1500EXD is an electronic LED padlock, which needs to be charged and used, and the 4-12 digit direction password can be set, and the price is 298 yuan.
 
Master's combination locks are mostly suitable for lockers and travel bags, but they are small but fragile and can be easily damaged. If you plan to buy a password lock with a higher security level, you can choose Master's high-security password padlock series, which is mainly composed of brass lock body and hardened alloy steel lock beam, with higher hardness, stronger anti-attack performance, and higher price, basically above 100 yuan, if it is mainly used outdoors, you can also choose this series of stainless steel password padlocks, which have stronger rust-proof performance, and are not easy to rust after long-term wind and rain, and the price is 89 yuan.
 
Master key lock is mainly industrial-grade brass padlock, the lock body is made of the same material as the lock beam and the high-security combination lock, the solid lock body is thick and strong, the marble lock cylinder is made of H59 brass, the copper content is high, the mechanical properties are good, durable and not easy to rust, the price of different specifications is between 30 yuan and 160 yuan, in addition, the series can also customize the flush open padlock, that is, a set of padlocks with a universal key, suitable for managing multiple warehouses in the factory.
 
At present, Master is still producing the mille-feuille steel padlock invented by its founder, which is strong enough to withstand a certain amount of external force. Commercial mille-feuille steel padlocks are divided into two series of marble lock cartridges and gallless cylinders, the gallless lock series does not have a lock cylinder, the key tooth flower needs to fit the position and shape of the wedge-shaped block inside the lock body to unlock, the anti-pry performance of the lock cylinder is not as good as the marble lock, therefore, the price is relatively low, the price of the 500MCND with a lock beam diameter of 7mm is 23 yuan, and the price of the same specification of the marble mille-feuille lock series 3MCND is 78 yuan.