Octura Drive Dog for Octura 3/16" propeller shafts. This size is good for the smaller size Octura props with small prop hubs. Specs: 5/16" (7.94mm) Diameter Nickle plated and hardened for strength This can be used as an upgrade part for many of the Aquacraft boats with 3/16" (4.75mm) shafts, for example, SuperVee 27, Revolt, UL-1, Lucas Oil, Motley Crew. Requires: Allen Driver in the .050 size.