Zinc Yamaha Trim Tab Anode for 200 - 300 HP Motors A trim tab anode helps counteract the torque that a propeller creates, and levels out "prop-walk," which is a propeller's tendency to rotate concerning a vertical axis. Also, trim tab anodes can absorb various types of corrosion, helping alleviate corrosion to other parts of the boat.Features: Designed for 200-300 HP Yamaha motors; Meant for saltwater boat use; Boat type: Motorboat with outboard; Specific: Outboard; Specifications: Material: Zinc; Weight: (lbs) 1.40 / (kg) 0.64; Dimensions: h: (inch) 1.18" / (mm) 30; h1: (inch) 2.36" / (mm) 60; A~: (inch) 3.94" / (mm) 100; m: (mm) 10 x 1.25; *Sold as an Individual - cis2:mm5mnJlm -Specifications: Material: Zinc; Quick Guide (pdf)