This buckle upgrade kit will fit any Alaska Guide Creations Bino Pack. The female buckles are snap in style, so that you no sewing is necessary for replacement. The male buckles have an auto-locking feature that allow you to tighten the harness, but keep your pack from loosening without you pressing the lock release button. The male buckles simply thread into the current harness and replace the original buckles. Each kit includes 4 female snap-in buckles and 4 male auto-locking buckles.