Aluminum, clamping halves feature dual cross-bolts for maximum holding power in the rear sling slot on collapsible, carbine buttstocks. 1¼" wide, push-button swivel allows instant removal/installation; 360º rotation prevents sling twist. MCTAR-10 fits the current military issue M-4, 6-position buttstock. Mfg: Midwest Industries, Inc. SPECS: Base - 6061 aluminum, hardcoat anodized, black. Swivel - Steel, polished blue finish. Fits slings up to 1¼" (3.2cm) wide.