Comparison : Item # ST-1-38, ST-1 Series Cap Style Stationary Single Pulley Truck for 1-3/8 Inch (in) External Halyard Pole Diameter
Item # ST-1-12, ST-1 Series Cap Style Stationary Single Pulley Truck for 1-1/2 Inch (in) External Halyard Pole Diameter
Item # ST-1-34, ST-1 Series Cap Style Stationary Single Pulley Truck for 1-3/4 Inch (in) External Halyard Pole Diameter
Item # ST-1-16, ST-1 Series Cap Style Stationary Single Pulley Truck for 1-15/16 Inch (in) External Halyard Pole Diameter
Item # ST-1-20, ST-1 Series Cap Style Stationary Single Pulley Truck for 2 Inch (in) External Halyard Pole Diameter