Material: Birch wood & Nylon strap & Iron buckle Outer Diameter: 9.25 inches (23.5cm) Inner Diameter: 6.7 inches (17cm) Ring Thickness: 1.25 inches (3.2cm) Strap Width: 1 inches (2.5cm) Strap Length: 15ft (4.6m) Weight Capacity: 1100lb (500kg)