The adjustable strut. Aluminum, CNC cut for square drive flex cable. This can also be used with a standard 1 piece flex cable by removing the prop shaft and using a one-piece cable, for example, ose-cable-1190. Works well on catamarans with transom overhang. Measurements, see pictures 4 and 5. 110mm (4.3") in length. 26mm tall x 24mm wide. Lead teflon bushing for 3/16" (.187", 4.75mm) propeller shaft. Includes: (1) Strut (1) Prop shaft (1) Bullet Nut, 10mm diameter pn# tfl-518B61 (1) Drive Dog, 10mm diameter pn# ose-80246 Requires: Square drive Cable pn# Oct-oc6sql-24a Stuffing tube 1/4" Or the alternate cable would be pn# ose-cable-1190 for a one-piece cable system.