Self-adjusting tensioner Arm Rotation 70 Degrees For Chain Number 60 For V-Belt Size Not Applicable Sprocket Outside Diameter 3.52 in Maximum Tension Force 42 lbf Arm Length to Hole Center 4.5 in Arm Material Aluminum Base Diameter 3.34 in Features Automatically Take Up the Slack and Avoid the Risk of Over-Tensioning Drive Components to Enhance Overall Drive Operating Efficiency Housing Material Aluminum Includes CS6002 Sprocket RT3001 Tensioner Minimum Tension Force 0 lbf