This is the Robart Axle Adapter with 3/16" Axle for use with 3/16 Wire Struts. FEATURES: Eliminates heating and bending axles and reduces the probability of damaging or breaking wire struts Flanged axle eliminates the need for outside wheel collar Linear dual set screw design (flat spots ground on one side of the wire only Compatible with Robart"s compact Uni-Brake as well as the following Robart products; 510W1 ROBQ0510 523W1 551W1 ROBQ0553 511W1 ROBQ0525 524W1 604HD 513W1 525W1 606HD ROBQ0006 520W1 ROBQ0570 530W1 608HD ROBQ0608 521W1 ROBQ0570 531W1 609HD ROBQ0609 522W1 550W1 611HD ROBQ0611 INCLUDES: Two axles, two adapters, four nylon spacers and five set screws REQUIRES: Threadlocker for set screws, DTXR2010 jxs 12/21/09 ir/jxs