Couples five Ultimag AR-15 10 round magazines together for instant mag changes.Carry 50 rounds in 50 states.Includes 5 Ultimag AR-15 10 round magazines.Weight      1 lb, 2.3 oz.  (520 gr)Width        8.27"  (210 mm)Height       8.27"  (210 mm)Length       3.03"  (77 mm)Note: This coupler ONLY fits the FAB Defense AR-15 Ultimag magazines. It does not accommodate any other magazine.