Ronstan Series 75 Core Block - Mast Base engine control Swivel fork has a 5mm

Swivel fork has a 5mm and 11

12" & 16" base length (bearer to pedal)

Square Port 1-7/8"

0625" (53mm)

1/4"UNF Stud & Nut  with a 10/32UNF Internal Thread to suit Morse 33c Cables

Ronstan Series 75 Core Block - Mast Base engine control Swivel fork has a 5mmCore Blocks are a true all round solution. A tuned 2 stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for