Comparison : Item # OT178, OT Series Cap Style Stationary Single Pulley Truck for 1-7/8 Inch (in) External Halyard Pole Diameter
Item # OTH, OT Series Cap Style Stationary Single Pulley Truck for 2 Inch (in) External Halyard Pole Diameter
Item # OT1, OT Series Cap Style Stationary Single Pulley Truck for 2-3/8 Inch (in) External Halyard Pole Diameter
Item # OT25, OT Series Cap Style Stationary Single Pulley Truck for 2-1/2 Inch (in) External Halyard Pole Diameter
Item # OT2, OT Series Cap Style Stationary Single Pulley Truck for 2-3/4 Inch (in) External Halyard Pole Diameter