Panther Outboard Aluminum Motor Bracket. Its heavy duty light weight aluminum is designed for fresh water use on both powerboats and sail boats. Unit is spring loaded. 11" of travel with 5 stops.( Not to be used with 4 stroke engines.) Features of Panther 55-0021 Outboard Aluminum Motor Bracket Lightweight design Sturdy durable aluminum Travel distance of bracket is 11" with 5 stops Spring-loaded bracket Package Contents: Panther 55-0021 Outboard Aluminum Motor Bracket Panther 55-0021: Outboard Aluminum Motor Bracket