Dirt, debris, object and rotational damage can happen to your engine during top overhauls or cylinder removal, which can lead to additional maintenance and expense. The Topcap engine protector is made to fit over the cylinder studs and shield the inside of your engine while maintenance is being performed. Topcap engine protectors are used by leading mechanics everywhere. Fits most engines including Lycoming Wide Deck 320, 360, 540, 720, and Continental 470, 520, and 550 series engines. Allows for full crankshaft rotation Made of fuel and solvent resistant polymer. Price is for a pair. 2 lbs (1Kg) shipping weight.