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A 32 mm OD x 9 mm wide passive side wheel from the 'SG90 Wheeled Serpentine Snake Robot' kit. It has a 13.05 mm press pocket, 5 mm deep, for a 624 bearing (4 x 13 x 5 mm), and a 4 mm outer web with a 10 mm through-hole so an M4x16 SHCS and washer can bear on the inner race. A 3 x 1.5 mm centred tread groove takes a rubber band or O-ring tyre for sideways grip.