Harken Bullseye Fairlead as used in Laser Kicker Block  Use the 237 and 339 where there is little deflection in the line such as when routing a spinnaker pole foreguy aft along the cabin house.   Maximum line Ø (in) 1 in Fasteners (mm) 5 RH mm Fasteners (in) #10 RH in A (mm) 32 mm A (in) 1 1/4 in B (mm) 38 mm B (in) 1 1/2 in Fastener spacing (mm) 25.4 mm Fastener spacing (in) 1 in