A KimPro® Tac-Mag® maximizes the performance of any 1911 pistol. Premium features include Teflon-coated stainless steel follower, Rocket wire spring and large round-count recognition holes. An exclusive quick-change floorplate permits the immediate attachment of one of three included bases – a conventional stainless steel plate, slim bumper pad for carry or a thick bumper pad for competition or use with extended magazine wells.
If you are looking for magazines to go with your full size 1911 then you will want to stay away from these. While they don't say it in the description they are for a compact 1911 in 45 ACP. I am certain that they would have worked in my gun had I purchased a compact 1911 in 45 ACP.