Self-adjusting tensioner Arm Rotation 45 Degrees For Chain Number Not Applicable For V-Belt Size B Pulley Outside Diameter 5 3/64 in Maximum Tension Force 30 lbf Arm Material Aluminum Features Alloy Steel Compression Springs Self-Adjusting Tensioner Eliminates Need for Regular Manual Retensioning Minimum Tension Force 0 lbf Mount Hole Diameter 13/32 in Product Type Rotary Tensioner Idler Pulley Assembly