Whitecap Clamp On Steering Control Knob This Whitecap steering control knob is designed for use with most standard Destroyer Wheels. Constructed from 304 stainless steel to hold up in both fresh and saltwater marine environments. Using the including locking nut this control knob easily clamps on for easy use. California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Product MPN S-9005