25 - 5/8" (Whistle), 5/8", 1/2" (Whistle), 1/2", & 3/8" Black Side Release Buckles (5 Each) For Paracord Bracelets 5/8" (Whistle - Flat), 5/8", 1/2" (Whistle - Contoured), 1/2", & 3/8" Contoured Side Release Buckles 3/8" - 10mm Opening For Webbing or Straps - 1.14" Long, 0.59" Wide 1/2" - 12mm Opennig For Webbing or Straps - 1.44" Long, 0.70" Wide. 5/8" - 14mm Opening For Webbing or Straps - 1 5/8" Long, 7/8" Wide 5/8" Whistle - 19mm Opening For Webbing or Straps - 1.9" Long, 0.87" Wide, 1.1" Wide At Whistle Tip