The 254mm steel mecanum wheel is a heavy duty mecanum wheel. Each wheel is comprised of 12 nylon rollers, mounted so that their axis of rotation is 45 to the axis of the main wheel. as well as moving forward and backward like conventional wheels, steel mecanum wheel allow sideways movement by spinning wheels on the front and rear axles in opposite directions. The wheel is sold in assembled units with aluminum axle.These axles and rollers are sandwiched between two thick steel plates. The rollers are made of black nylon, the steel body mecanum wheels of load capacity is higher than aluminum mecanum wheel. Specifications: Diameter: 254mm Width:  95mm Number of Rollers: 12 Number of Plates: 2 Body Materials: Steel Roller Material: Nylon Spacer Material: Aluminum Length of roller: 92mm Diameter of Roller: 38.2mm Net Weight: 4.2kg Load Capacity: >60KG