Primus Model 740 – 13.5in Wheel With Knob & Finger Grip – 3/4in Tapered Shaft With Faux Nut – 1/2in & 3/4in Adapters. The Primus Wheel is a 3 spoke stainless steel steering wheel that can be a great addition to any boat. This specific steering wheel comes with a Santoprene finger/rim grip, spoke inserts, and a fitted centered faux nut.Features: The wheel is made of polished 316 cast stainless steel, which is proven to be durable and long-lasting. Santoprene finger grip, Santoprene rim grip, and Santoprene spoke inserts Includes center faux nut . . 1/2in & 3/4in adapters for different helm sizes . Specifications: Rim diameter: inch 13 1/2in. Hole diameter: inch 3/4in tapered shaft . 3 spokes in a retail box