A simple robust mechanical lock. Tough alloy front and handle. Flush mounted ideal for personal storage in offices, schools and colleges. The user selects their own 4 digit code and this remains unchanged until they wish to alter it. The user can change their code at anytime and the KL20 has the added security and convenience of auto scramble. The dials automatically scramble to 0-0-0-0 when the lock is used, thus hiding the user code from others.