Colt, no, the hooks don't rattle - not even close to the cheap, all metal snaps. The two working musicians that use my banjo straps love them.
Funny, the first player I made a banjo strap for is a working musician - he insisted on snaps and I really didn't want to use them, So,I came up with my own design. It took quite a bit of playing to get the dimensions and process down but now they go together fairly easily. That being said, the hook on one end and a shield on the other certainly is not a time efficient design but it makes my work readily identifiable, showcases my pride in workmanship and attention to detail.