The set of automatic wheel chains include:56-253600 Brackets56-700500 Onspot 016 Air Cylinders56-236505 chain 12 pcs, or 56-236501 chain 6 pcsOperating speed: 2-50 km / h (1-35 mph)Activation speed: Max 50 km / h (35 mph)Power supply: 24V, 8A fusePressure requirements: 7-10 barNOTE: Chains are supplied separately for each truck model, please write your inquiry.