Marson USA 5.5" Motorcycle Wheel Chocks #T101-SS Chock Constructed of 1" heavy duty stainless steel tubing. Corrosion proof - it will never rust. Dimensions: Exactly 8.25" wide at the opening and 5.5" wide at the start of the radius x 9.25" high. 3/8" hex head sleeves and phillips pan head bolts are 1" long.