Model RC Boat Complete Coupling to join a 385 Motor to M2 Plain Propeller Shaft. This includes: 1 x 2.3mm coupling with grub screw for the 385-400 sized motor 1 x Universal joint (joins the 2 brass couplings) 1 x 2mm coupling with grub screw for the M2 plain propeller shaft The couplings tighten to the shafts using the grub screw. (Please note: Motor shown in image not included and is for display purpose only, to show suited motor)