Master Lock’s new 3630, 3631 and 3670 Multi User Locks allows a locker user to set their own temporary 3-digit combination for the duration of there visit, eliminating the need for system charting. The are designed for standard lift handle lockers were there is an interior locking bar that travels up and down to lock the door. The Master Lock 3630, 3661 and 3670 feature a heavy duty solid zinc housing ideal for areas of high use. Ideal for Health and Recreation Facilities, School, Employee and athletic lockers. Extension kits are available for use in doors up to 3/4″ thick. For more information visit the Master Lock Section of our website.