This is a Safariland Triple Pouch known as the 333, model 333-3-2-175.
The Model 333 Triple Speedloader Holder features external clips and molded loader cups for ultra-quick access; ideal for competition or tactical use. Will accommodate the Safariland(R) Comp I" Comp 2" and Comp 2I speedloaders.
Features:
Fits belt width of 1.75";Fits SLJ-K2S