Wehrs 5" Spring Dual Bearing Slider. A linear ball shaft bearing instead of bronze bushing is used along with a shaft stabilizing internal piston for the smoothest and most stable slider on the market. The spring cup opposite the adjusting nut is quickly removed with a clip, so you don’t have to unscrew the nut to remove the spring. Also a four position locking mechanism for fine tuning. There's a Torrington bearing on the adjuster nut so you can adjust it easily and so the spring works freely throughout its travel. The length is on the standard sliders are 24 (WEHWM251) and 26" (WEHWM251-2).