A plastic D-ring by any other name would still be ... a plastic D-ring. This piece of hardware is so named mainly because it is shaped just like an uppercase "D". You can use it to secure a nylon, fabric or leather strap to a surface with another nylon, fabric or leather strap. Light and easy to place/replace, most do-it-yourself projects include a plastic D-ring.
Try your hand at custom-designing your own stylish belts with this free instructional, compliments of your friends here at Country Brook Design. Once you know what to look for, you'll find the ubiquitous D-ring serving in all manner of places -- bags, dog collars, and shoulder bag straps, just to name a few.