Purchase two or more items, you could possibly touch customer service to request the type of master key. If you do not contact, the default is to send the master keys can open all locks,not just five or ten locks in the group.We are a Chinese producer of lockout tagout lock devices. If you wish further lock leadership requirements, please touch our customer service.BOZZYS is a Chinese manufacturing facility specializing in the manufacturing of Lockout Tagout products.We have 12years of Lockout Tagoutproduct design and production experience, providing and designing reliable and relevant leadership strategies for many devices.Key leadership system: Keyed differ,keyed alike,differ&master key,alike&master key,If you need a custom master key, please touch us.KD ability keyed different,the key can solely open the corresponding padlock.KA capability keyed alike,all keys can open any padlocks.The padlock adopts bolstered nylon one-piece injection-molded lock shell, which is resistant to temperature difference (-20°--+177°), impact resistance and corrosion resistance.There are eight regular colours to come to a decision from: red, yellow, blue, green, black, white, orange, purple. Can meet the classification of safety management. Various colors could be personalized in keeping with visitor requirements.Safety Padlock has key preserving feature,and key cannot be pulled out in open state, with the intention to prevent the most important from being lost.The key of the padlock could be customized with diversified shade key covers, immediate id with colour matched lock and key.The non-conductive, non-sparking shell of the padlock can protect staff from electric shock.Padlock cylinder is made from zinc alloy , that are fabricated from copper, stainless-steel and other materials, and the auto popup lock shackle also can be customized. Zinc alloy cylinder is 12-14 pins , it will understand that greater than 100,000pcs padlocks do not open every single other.Copper cylinder is 6 pins , it can realize that more than 60,000pcs padlocks don't open each other.