Features: * Flexible with single door strap * Designed for use on wood-frame sliding doors from 1-1/2 in. to 2 in. thick * Slot in top of door strap allows lateral and vertical adjustment * 450 pound capacity per pair * Packed with two end caps and bolts for attaching door strap * Made of durable one-piece precision-formed steel and has self-lubricating Delrin bearings What"s In The Box: * Stanley Hardware 168815 Flexible Box Track Hanger 450 - Pair