Aftermarket accessories QD Sling swivels for Mossberg rifles and shotguns 500,590 mossberg shockwave etc, one inch locking QD sling swivel mounts fits standard sling studs found on most Mossberg tactical shotguns and hunting rifles. Sling swivels are made from steel color is black. Length 1.25". Inside loop is 1.3". Two in a set. Limited one year warranty.