The D-1050/1054 Series is an extra heavy duty slide on solid rollers for vertical alignment and ball bearings for horizontal thrust. The D-1054 series locks at the fully closed position and at the fully extended position. Bottom Mount Slides are heavy duty and space saving. They are constructed of a heavy gauge, cold-rolled or stainless steel coupled with stainless steel rollers. Bottom mount slides are the best choice for a variety of weight-load applications in the electronics, aerospace, heavy equipment, emergency vehicle, and transportation industries. These slides are great for when space is at a premium aboard ships, in control rooms, in mobile broadcast and are designed to handle compression loads up to 1,200 lbs. per slide.