Raise the roll center in your car to improve handling and increase corner speed.  This is one of those little things that the fast guys do and nobody ever notices it, and if you ask them about it they will just play dumb.  If you have been racing very long, you know what I am talking about. 

3/8 Inch longer than stock.

Overall Length: 4 5/8 Inches

Pin Length Overall: 2 7/8 Inches including threaded part.

Thread Size: 9/16 - 18

Thread Length: 1 1/8 Inches

Pin Length Smooth Part: 1 3/4 Inches

Pin Size: Smooth part starts at 11/16 and goes up to 7/8 over the distance of 1 1/8 inches and stays 7/8 for the remaining 5/8 of an inch.

The OD of the ball joint at the point it fits in the lower a frame is 2 inches. 

Style: Press in / weld in.