40in Pair 1000 - 2000mm 150KG Capacity Heavy Duty Trailer Drawer Slides Rails Runners LockingHeavy duty drawer slides with lock Featuring Lock Design. locked by the locking function. Prevent from sliding. Easy control and secure fixation. this slide rail opening and closing test 100,000 times. With hold still lock & Detachable There is a blue handle to lock and unlock. When it is fully extension or fully closed,the slides will be hold still automatically (in locking state),which can prevent from sliding casually and keep your drawer stable