Trip edge Snow Blades feature four compression springs. It™s heavy duty design allows full down pressure. Oscillation allows edge to follow uneven surfaces. Trip Edge Snow Blades range in size from 84 (2133 mm) to 108 (2743 mm). Recommended for loaders with operating capacity greater than 1,500 lbs. For more information, check out http://www.ceattach.com or call the friendly experts at CEAttachments at 1.866.232.8224.