Octura 1/4" Shaft stepped down to 3/16" (4.75) for 3/16" props.Designed to be used with the ocfsf2525 Flex Ferrule. The ferrule will hold both the shaft and a 1/4" flex cable. 1/4" (6.35mm) outer diameter.Includes:- Stainless Shaft- Thrust washers- Stainless Bullet nut- Stainless Drive dog