This ProMag pistol magazine loader for 9mm & .40S&W double-stack magazines has top dimensions of 1-3/8 x 7/8 inches and smaller. It is constructed of high-carbon steel, with a blued finish. A pistol magazine loader for 9mm & .40 S&W double stack magazines with top dimensions of 1-3/8 x 7/8 inches and smaller. Constructed of carbon steel, with a black oxide finish. 9mm and 40 S&W double stack magazines with top dimensions of 1-3/8 x 7/8 inches and smaller Made of carbon steel with a black oxide finish Made in the USA