The Ken-Tool Shark Fin Dual Wheel Separation Bag, No. 34555, is a rubber coated, Kevlar bag that uses air pressure to create 5,000 lbs of force to separate and remove stuck dual wheels off the axle studs and hubs. It is safe for use on steel, aluminum or chrome wheels from 15" to 24.5" rim diameters. The Shark Fin is inserted between the tires after they are off the ground and the lug nuts are loosened. Compressed air is added the bag, using the attached 3' inflation hose. Rated at 150 psi, it delivers 2.5 tons of expansion force at 87 psi, breaking the corrosion. The bag can be used on steering axle wheels and inside dual wheels, too.