This is the Engine Clutch Nut for the Duratrax Nitro Evader ST. This has an integrated pilot shaft. FEATURES: Durable metal construction This piece threads onto the crankshaft and holds the flywheel on The clutch bell bearings go on this part after it is attached to the crankshaft INCLUDES: One Clutch Nut (Key #133) One 5mm Washer (Available seperately, use DTXQ0503) One 4mm E-clip (Available seperately, use DTXQ0525) mlm 05.09.03 ir/jxs BOX DIMENSIONS: 2.75" W. X .38" H. X 3.00" L. BOX WEIGHT: .02 LBS.