This is a DeSantis Gunhide Magazine Pouch known as the A35, model A35TJQQZ0.
This design divides the speed-loader in half over the belt" reducing much of the bulk and offering maximum concealment. The speed-loader will not fall out when the cover flap is unsnapped. The Second Six(TM) also features a unique belt-adjustment system that allows the carrier to fit snugly on any belt up to 1 3/4" wide. Available in black or tan unlined leather. Fits HKS and similar size speed-loaders.
Features:
Features a unique belt-adjustment system that allows the carrier to fit snugly on any belt up to 1 3/4 wide;Design divides the speed-loader in half over the belt, reducing much of the bulk and offering maximum concealment