1-⅞" Throttle Knob - Red Grooves316 Cast Stainless Steel1-⅞" Throttle Control Knobs Fit Hynautic D-Dec/Sturdy Controls Throttle Knobs are colored for Sight and Grooved for Feel - Meets ABYC Specifications Product : ONGARO THROTTLE KNOB RED 1-7/8" GROOVED Manufacturer : SCHMITT & ONGARO MARINE Manufacturer Part No : 50044 UPC : 768170500446