The black 5/8 inch hardware is used as adjusters with belts, collars, rifle slings, shoulder straps, bag straps, etc.
All Purpose Strap Buckle 5/8 Nickel Plated 1538-00 by Stecksstore
Zipperstop Wholesale YKK Hardware Kit Buckle SHOCKONLOC Dual Adjuster, Strap Adjusters, Loop, Polypro Webbing Strap (2pcs - YKK Loop 1 Inch Wide, Black)
Double Loop Strap Adjuster 5/8 Inch Black Plate 20058-13
Swivel Snap Hook Clip Antique Nickel Plate 1-1/4 15267-21
Double Loop Metal Strap Adjuster 5/8 Inch Black Plate 20058-13 - Stecksstore
Women's Double Harness Metal Loop Belt - Universal Thread™ Black : Target
Metal Hardware for Straps Buckles for straps, Rings, Slides, Hooks
1/2 Inch Plastic Strap Adjuster Black - Strapworks
Jygee 2 Pieces Backpack Webbing Buckles Replacement Harness Holder Bag Component Adjustment Ladderlock Slider Fastener Replacing Part