This is a ProMag® Double-stack magazine loader for 9mm and .40 S&W pistols.
Designed for use specifically with 9mm and .40 S&W Glock® pistol magazines, these magazine loaders are crafted from injection-molded, glass-filled polymer for maximum durability and lightweight practicality. Save your fingers from fatigue and maximize your trigger time at the range with these easy-to-use polymer magazine loaders from ProMag.