The black double loop 3/4 inch hardware is used as adjusters with belts, collars, slings, shoulder straps, bag straps, etc.
Guitar Strap Embossed Adjustable Leather for Acoustic Electric Guitar Strap (Beige), about 6.6cm ( 2.6 inch ) : Musical Instruments
Double Loop Metal Strap Adjuster 3-4 Inch Black Plate 20034-13 - Stecksstore
Double Loop Metal Strap Adjuster 3-4 Inch Brass Plate 20034-01 - Stecksstore
uxcell Plastic 1 Wide Webbing Strap Side Release Buckle 20Pcs Black : Industrial & Scientific
.com: Stecksstore Strap Slide Adjuster 2 Inch Nickel Plate 20020-02 : Clothing, Shoes & Jewelry
Double Loop Metal Strap Adjuster 3-4 Inch Black Plate 20034-13 : Arts, Crafts & Sewing
Double Loop Metal Strap Adjuster 3-4 Inch Brass Plate 20034-01 - Stecksstore
Double Loop Metal Strap Adjuster 3-4 Inch Black Plate 20034-13 - Stecksstore
uxcell Plastic 1 Wide Webbing Strap Side Release Buckle 20Pcs Black : Industrial & Scientific