The Blue Force Gear Elastic Hook Cover installs over attachment hardware such as Sling Snap Hooks or MASH Hooks and reduces noise and prevents scratching of the weapon's finish. The Hook Covers are slightly tapered to fit securely on hooks or other hardware. Not recomended for use with Push Button Sling Swivels, RED Swivels, or Side Release Swivels as the Elastic Hook Cover may impede the use of the swivels.FeaturesPrevents scratching and reduces noise metal sling hardware such as Sling Snap Hooks or MASH HooksSlightly tapered to fit securely on hooks or other hardwareNot recomended for use with Push Button Sling Swivels, RED Swivels, or Side Release Swivels as the Elastic Hook Cover may impede the use of the swivels