Why do many offices, hotels and access roads use mechanical password locks? Because the whole mechanical password lock does not need batteries, no electronic circuit, mechanical principle of door opening, low-carbon environmental protection, no lock hole and so on, which brand of mechanical password lock is good? We can refer to the rcl-208a second generation mechanical code lock of Lelang hardware. The all digital key mechanical code lock is specially designed for the interior door, which is simple, convenient and generous, regardless of left and right door opening.