7/8" diameter x 23" long anti roll bars for S&W rear frames 10-400, 10-508 10-510-24 & 10-511-24 as well as any other frame or application where a 23" long bar will fit best.By equalizing traction & preventing body roll, anti-roll or rear torsion bars, as they are sometimes called, have been shown to produce consistently quicker 60' times. This ...