The combination lock for sale materials on the market have complicated classifications, diverse processing technologies, and different specifications and standards. So how to choose door hardware locks, I have compiled some hardware manuals, which give a detailed explanation on how to choose hardware locks.A look at the lock material The lock materials on the market are basically divided into stainless steel, copper, and zinc alloy. Stainless steel has high strength, strong corrosion resistance, and does not change color. It is the best lock material; copper is more versatile, has superior mechanical properties and higher prices; high-quality zinc alloy locks are strong and wear-resistant, have strong corrosion resistance, and are easy to form. Mostly used for mid-range locks.Second look at the surface treatment of locks Surface treatment is roughly divided into three types: electroplating, spraying and coloring. The lock forms a dense protective film on the surface of the product through surface treatment, which plays a role of anti-corrosion and rust prevention, making the lock more beautiful and durable. Dense protective film is also a measure of the quality of locks. Good quality locks are mostly electroplated. The coating is fine and smooth, uniform and moderate, bright in color, and free of bubbles, rust and signs of oxidation.Three look at the lock implementation standards Foreign countries have very strict standards for hardware locks, so the quality of imported products is relatively high. We can feel the quality of the lock by hand. Generally speaking, locks that feel heavy are of relatively high quality; the lock body should not be exposed to the tip, which can easily hurt people. Pay particular attention to the end of the lock handle, the bolt and the four corners of the lock body; the lock with a good lock spring Flexible opening, high sensitivity and long service life. There are also many styles of safety padlock, so be sure to keep it consistent with the style of interior doors.