I've ordered 4 of these already. They feel like really good quality. It's a really good investment of such a low price to prevent my really expensive instruments from falling on stage as my straps used to slip off occasionally. The reason for 4 stars is because it's a little hard to get them installed on your strap depending on the thickness. On my really fat strap it took two of us to squeeze the two washers hard enough to be able install it, while on my thin strap there was a lot of space between the washer and strap so I had to wrap it with something to stop it from wobbling around (I used fishing line). You could see on the photo what I mean. But great strap locks besides that.