Made from 1/2 Inch thick steel stock and are available in 1 Inch and 2 Inch widths. Collar is available in 4 Inch, 5 Inch and 6 Inch diameter (approximately 12-1/2 Inches, 15-1/2 Inches and 18-3/4 Inches in circumerance). The "Figure 8" cuffs are available in several diameters. Lock with two small "luggage" locks (not included). Please check measuring instructions at the bottom of the Steel Bondage Page.