This thumb-operated lever arm pistol speed loader is secret to fast and easy operation. No sore fingers. No fatigue. Capable of loading 15 rounds in 18 seconds, single or double stack mags. Works equally well right or left handed. Features: Faster and easier than ever before, our magazine speed loader quickly loads double stack magazines It's this simple - magazine slips into loader and is held by hand Depress thumb lever and load The HKS magloader capable of loading 15 rounds in 18 seconds