The Flex Gel-Lock technology built into this hook means it will stay put once you lock it into place using its twist grip feature, which activates a vacuum seal that locks air out. This durable double hook is made of durable plastic, so its easy-to-clean, and youll never have to worry about it rusting. Flex Gel-Lock Double hook is great for slim shower stalls where space and storage is limited. One simple hook can make a big difference by providing access to the items you need in the shower. Made to hang two loofahs or washcloths, or a razor, it can also be used on the reverse side of a smooth glass shower stall to hang larger towels, a bathrobe etc. Measures 2 x 3 x 2 inches (6 x 7.5 x 6 cm). For best results, we recommend tightening the GEL LOCK knob once a month.