The SF2 allows the left shoulder strap of any 2-inch continuous webbing harness to be freely adjustable, making your harness much easier to doff and don. The SF2 is especially useful with drysuits and for those divers with limited shoulder mobility, yet installs without cutting the webbing. Made of marine grade stainless steel, the device works with a 2-inch continuous webbing harness and most backplates (although the use of some force may be required to initially insert the ring in place on some plates.) During initial assembly of your webbing harness just insert the SF2 into the back of the diver's left waistband slot on the plate then thread the webbing through the SF2.