Review on 30Pcs EuTengHao 9X5.5Mm Silver Pin Keepers Locking Pin Backs Clasp Lock by Eric Froedge

The backs lock very well on my pins, but be careful to not over-tighten the screw as it can cause the pin-needle to separate from the rest of the pin from tension. I had a few cheaper pins break because of this, but I don't think it was these pin backs' fault. Otherwise they are easy to use, especially if you attach a small magnet to the hex wrench to attract the screws onto. I also had to install the back with the recessed side facing the pin, and the flat side out, for the best secure fit.Taking off a star because I was missing pieces, only received 57 of the black screws used to lock the pin in place, not 60. By the time I got around to counting up and attaching these, the window to contact the seller through Walmart was closed.