South African made Vektor mag couplers (brand new). These mag couplers are designed to keep the two mags together by applying tension with a screw on two straps running around the body of the mags.
 
Each set includes the following:
2x straps
2 sets of screws and blocks to tighten the straps
 
These straps work with a wide variety of mags, including AR, AK, Galil steel mags etc. However, they were designed for the 35rd polymer mags made by LEW.
 
Made in South Africa.