Expand your round capacity to Seven Shots with ATI's Aluminum Mag Extensions for Remington 870 Shotgun. Holds an Additional Two 2 A 3/4" Shotgun Shells Constructed of Military Type III Anodized, 6061 T6 Aluminum Virtually Indestructible Minimum Barrel Length of 18.5" for 7 Shot Extension New Spring Easy Installation Ratchet Base for Tight Fit Banding Around Base to Distinguish Between Winchester (3 Bands) and Remington (2 Bands) Mag Extensions Manufactured in the USA Limited Lifetime Warranty Fits 12 GA Remington 870 Shotguns Note Holds 2 A 3/4" Shotgun Shells