The SpeedLoader Holder is designed for adjustable retention and great for concealed carry as well as competition. It attaches with a belt clip. The holder fits S&W 586, 686, 681, 581 L Frame; S&W 10, 12, 13, 14, 15, 16 K Frame; Ruger GP100 and Taurus 606, 65, 66, 80, 82. Speed Loader Model/Brands- Safariland Comp II Group 4, Comp III, Group 8 and HKS 586A, 10AT.