Adapter bar lets you carry a bike with an alternative frame shape on your hitch-, trunk-, or spare-tire-mounted bike rack Provides a horizontal mounting point for level transport of your bicycle The versatile design lets you use the bar with most bikes and bike carriers Fits most bike frame styles, including women's, children's, and alternative frames Works with single- or dual-arm racks The telescoping tube extends from 15-1/4" to 22-5/8" to ensure a snug fit on your bike frame Push-button-operated hooks allow quick and easy installation on your bike's frame Hooks connect to your bike's seat post and handlebar stem post Rubber coating prevents the bar from marring your bike's paint Hook opening dimensions: 3-1/2" long x 2-1/8" wide Steel construction with black powder coat finish is durable and rust-resistant