Hi-Lift Jack TM-700 1"-2" Adjustable Tube Mount The Hi-Lift Jack Adjustable Tube Mount system is designed to allow secure mounting of Hi-Lift jacks to tube bumpers, bull bars, roll cages or roof racks. Manufactured from 6061-T6 structural aluminum with stainless steel hardware. Fits tubing 1 - 2 inches in diameter Manufactured from high quality structural aluminum Stainless steel hardware No drilling required