Small 3/8" Glow in the Dark Side Release Buckles for Paracord Bracelets small paracord bracelet buckles inside slot measurement: 0.4375 inches (for 3/8" webbing or paracord) buckle width at widest point: 0.60 inch buckle length: 1.13 inches They do have both upper and lower tracks/glides for ease in opening. For brightest glow, place in direct light before use.