Snakeman 4WD brand Adjustable HIGH-LIFT Mounting System The adjustable Hi Jack mount has been designed to allow High-Lift jacks to be securely mounted on roof racks, piping, safety cages or tubular bumpers. It fits round or square tubes with a diameter of 55-65mm. The mounts are made from strong 6061-T6 structural aluminium with stainless steel hardware for durability and a rugged look. Three sizes of threaded clamps are included: inner diameter 55 / 56 / 66mm outer height 85 / 100 / 120mm internal height 60 / 70 / 85mm Wire diameter 6mm