Bravo Jewel, Stud &nbsp Spike Dog Collar 118NKJS (Red, 1.5 in. wide and 21 in. long) 1.5 in. width and 21, 23, 25, 27 and 29 in. Collars and harnesses made by this company are measured to the end of the strap, not to the last hole. Please allow an additional 2-3 inches when choosing a size.