The ends of E-Track rails are open and rather sharp, presenting a danger for all people who may accidentally collide with the rails. They are a hazard for clothing and ropes that can get snagged as well as any item that can get caught and ruined. The horizontal E-Track end caps cover all those possible risks by encasing the rail end with a smooth cap. Once the caps are clipped into the end, anything or anyone that bumps into the rail will simply slide off. The plastic E-Track end protectors are 33/4" high and 1.5" wide and snap perfectly into the ends of horizontal E-Track rails. The E-Track end caps are made of durable black plastic and are also available in orange. Click for black and orange end caps for vertical rails