Manufactured by Glock Inc. This blue floor plate will fit any 9/40/357/45GAP magazine. Direct replacement for floor plate 3206, uses standard insert currently in your mag. Part number 36 on the Glock Schematic.
I bought the blue and the orange base plates. I have both a Glock 17 and 22, one is 9mm the other is .40 S&W. The magazines are identical in size and shape you have to look to see the caliber markings to determine which one you have grabbed. I used the colored base plates on the 9mm mags to tell the difference. Works great.