Uproot trees, remove bushes, lift tractors with the help of the Hi Lift Jack Base Features a multiple ribbed design for greater stability and durability Made from premium quality polyethylene, this jack base is extremely durable and it can be used with any model of Hi-Lift Jack Compatible with most of the hi-lift jack model Jack base has a rippled underside that is specifically designed to offer firm grip on soft and unstable grounds Front: 690 x 435 mm / Rear: 490 x 435 mm