Jet 124204-1-1/2 Ton Extension Kit for Sbt/SGT Series Manual Trolleys Air Tools and a hollow styleProflex is

and a hollow styleProflex is also available with a heavier duty 5/8" spring centerChoose from three coupling stylesThey snap together in a second and are taken apart quickly with a spanner wrench or uncoupling keyWith the more recently developed "G"connector

A great addition to any toolbox

This product is Link for Ridgid Tools

Two square edges

Jet 124204-1-1/2 Ton Extension Kit for Sbt/SGT Series Manual Trolleys Air Tools and a hollow styleProflex isConverts trolleys for use on beams with flange widths from 8 Inch to 12 Inch , Includes suspension shaft , washers , castle nuts and split pins , Fits sbt and sgt series trolleys