Designed for use on wood frame sliding doors from 1-1/2 In. to 2 In. thick. Flexible design, the slot in top of door strap allows lateral and vertical adjustment. Includes 2 end caps and bolts for attaching door straps. Made of durable 1-piece precision formed steel. Zinc-plated finish. Self-lubricating Delrin bearings and 5-1/4 In. strap length. WeatherGuard protection.