WILLIAMS BROTHERS 1 1/2” SMOOTH CONTOUR WHEELS These are the 1-1/2" Diameter Smooth Contour Aircraft Wheels from Williams Brothers Model Products. FEATURES Black Rubber Tire Smooth Contour Style White Plastic Wheel INCLUDES Two 1-1/2" Smooth Contour Wheels REQUIREMENTS Installation on landing gear of aircraft SPECIFICATIONS Inner Diameter: 2.5mm (0.10") Outer Diameter: 38mm (1.5") Width: 12.15mm (0.48") Hole Diameter: 2mm (0.079")