[SELF LOCKING]: Threaded screw rod provides a self-locking function to prevent the stand from lowering without assistance. Designed to support vehicle components during repair, installation and removal processes. Ideal for holding exhaust systems and drivetrain components in position VEVOR Underhoist Support Stand, 3/4 Ton Capacity Under Hoist Jack Stand [EASY STORAGE]: Our 2-piece post easily unscrews making it smaller for storage when not in use., 3/4 Ton Capacity., All steel construction. Contoured saddle supports most component configurations. Support range from 54-1/2” to 79”-1/4” Fits into compact spaces to be easily packed away. Anthracite Coal Samples Jackco 43342 2 Stage 3/4 Ton Underhoist Stand Screw Jack [EASY ADJUSTMENTS]: Bearing Mounted Spin T Handle: Allows for smooth and easy turning when adjusting the height under the load. VEVOR Underhoist Stand, 3/4 Ton Capacity Pole Jack, Heavy Duty Jack... 3/4 Ton Capacity., All steel construction. Support range from 54-1/2” to 79”-1/4”.