Wheel Dia: 13cm / 5.1inch ; Capacity: 3kg / 6.6lb per wheel. Mounting Hole: 8mm / 0.31inch; Mounting Hole Depth:33mm / 1.3inch; Color: Black ; Material: Rubber Foaming, Plastic; Per Wheel Weight: 56g. Rubber foam material is a versatile and durable material often used for shopping cart wheels due to its shock-absorbing properties and resistance to wear and tear. Note: The wheel mounting hole has its own buckle, which is only suitable for the car bearing with grooves, otherwise it will loosen and fall. The shaft must be at least 32mm long at each end and 7-8mm in diameter. Suitable for fixing on shopping trolley, station hand pushcart, traveling luggage cart. Shopping Cart Wheel Replacement 5 Inch Dia Rubber Foaming Black 2Pcs (Load Capacity 22Lbs Each)