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Sumner Manufacturing Company ST-881 Series Hi Fold-A-Jack with vee head features a large convenient adjustment handle and is best suitable for load capacity of 2500 lbs. Jack is patterned with quick action lock washer that aids user in positioning height from 28 – 49easily and quickly. Jack featured with 1square tube base is best suitable for heavy use and abuse. It has patented fall guard feature that provides magnificent 1safety zone around lock washer. Heavy-duty jack featuring setscrew aids to lock jack head to stand for transportation and to render double margin safety. It has 1/2acme fine adjustment thread.