Synthetic-resin Bonded Fibre (SRBF) Block
This block is built up of steel bindings, and its means of attachment and sheave pins are of steel. The cheek plates and sheave(s) are made of synthetic-resin bonded fibre. These blocks are for use with natural fibre and man-made fibre ropes only and can be single, double, triple or snatch blocks with safe working loads of one, two or four tonnes. They must not be used with wire rope. (This type of block is currently on issue to units. Because of the block’s size it is not often practical to use these as heel tackles, although they make ideal purchases).
