12MM Key Switches is named by its installation size. The recommended size of our Security Key Switch also available in 16mm and 19mm. This 2 Position Key Switch is zinc alloy cast housing and cylinder and it is bright chrome plated standard. The internal structure is 7 pin tumbler mechanical and the key combination could reach 150 combinations. Furthermore, the keys of this On Off Key Switch is zinc alloy tubular, barrel chrome plated with plastic cover. We have all kinds of keys for our customers to choose from, for example, tubular or flat, plastic or metal or nickel plated. The function of this Key Lock Switch includes off on and on on. The circuit is also includes SPST and SPDT two types and the two-circuit could insure the operating circuit works in order, which could improve the operation cost and improve the work efficiency. Products Description: Zinc alloy die cast housing and cylinder Barrel chrome plated standard 7 pin tumbler mechanism 2 position (off-on) 2 terminals Hex nut or speed clip mounted 1 combination only All keyed alike or 1 combinations per 100pcs standard 5000 combinations available