The Venus Harness is the solution to keeping the Venus for men milker (or similar) in place while laying down or strapped in a Bondage Sleepsack. Top ring is 2.4" diameter, base is 2.3" diameter. Other sizes available upon request. Made from acrylic and genuine leather, this device will secure the unit in place to do it's job. Assembles & unassembles in seconds for easy storage and travel. Two locking pins quickly secure the belts in place. Two padlocks & custom length belts included. Venus not included.