Do you find your cylinder system riding up and banging into the back of your head? This can be annoying and possibly dangerous. There is an easy fix: adding a crotch strap to your back plate and harness set-up can not only eliminate the problem, but can give you increased stability when diving. The Hollis crotch strap is easy to install on your back pack or back plate assembly. Buckles are made from impact-resistant plastic for rigging. Comes equipped with a steel scooter ring for use with Diver Propulsion Vehicles (DPV&';s). Increases system stability Complete with stainless steel scooter ring Adjustable 2-inch webbing Used for fastening a harness and back plate securely to a diver&';s body Strap threads onto back-plate and loop on harness waist belt webbing Keeps harness in place during water-entry Prevents gear slipping upward on body in water Reduces likelihood of tank touching back of head Scooter ring: convenient for temporarily clipping an accessory to free your hands Slide release buckle for adjustable length Side-release squeeze-style quick-release buckle