This Atlas Lift has a commercial grade lock ladder. We believe that the lock ladder system is the safest locking system for any four post lift. The lock ladder system also provides an infinite number of runway locking positions. The "old-style" welded locks could not be adjusted. The lock ladder is adjustable inside the column so that our customers can "micro-manage" the correct runway height to accommodate any vehicle. The "lock ladder" column system is the same column system found on professional grade lifts found in car dealerships and automotive service centers.