Mul-T-Lock Classic (serrated driver pins)
Mul-T-Lock’s Classic cylinders have a special telescopic pin tumbler mechanism with internal and external pins. Both the internal and the external shear lines must be aligned simultaneously in order for the plug to rotate.
The patented Mul-T-Lock plug has a special structure. When the top and bottom pins, plug and body meet, a three-dimensional shear line is formed, creating an almost perfect spherical shape. Steel inserts enhance anti-drilling resistance.
No Special rules at this time for this lock.