HIGH QUALITY:This helmet locking system is made of quality materials, wear-resistant and durable. ADJUSTABLE BUCKLE:Adjustable buckles on the strap allow adjusting the tightness with one hand; Adjustable buckle on the strap allow adjusting the tightness with one hand. EASY TO INSTALL:Comes with 4 screws & nuts -- Easy to install and don't loosen in use. SECURITY AND PORTABILITY: suspension system improves security and portability. Makes helmet 3X more stable under rotational forces. USAGE:Fit for most ordinary helmets, such as fast helmets. Features: This helmet locking system is made of quality materials, wear-resistant and durable. Easy to use and adjust to fit your helmet. Comes with fittings for easy attachment. Useful accessory for airsoft games and many other uses. 100% brand new and good quality. Specification: Material: Plastic Color Options: Black; Green Suitable for Fast helmet Size: Approx. 20 x 19 x 9cm / 7.87 x 7.48 x 3.54in Weight: Approx. 335-340g Package List: 1 x Helmet Locking System 4 x Screws 4 x Nuts