Made of aero space grade billet aluminum. Our bearing housings have life time warranty, It utilizes a know common pgn bearing easily serviceable with no special tools required. bearing has a center load of 900 lbs with maximum rpm of 21,000 for smooth and easy drive shaft balancing! Get rig of unwanted play in your drive shaft. Save time in money in drive shaft repair extending the life of the u joints. Bearing housings also use a sure clamp design with a slip fit bearing. designed in Southern California includes 2 housing, 2 bearings , 2 clamps , 12 hardware bolts