Has a split frame and hooks to locate on brackets. The aluminium sheave is mounted on sealed ball bearings. Guide rings protect conductor from damage.

Designed to be strong but light, suitable for pole work. The aluminium sheaves are mounted on sealed ball bearings for low resistance.

This block has the same features as the CBS 687. Single sheave is offset to assist with, fixing conductor to clamp.

Suitable for stringing conductors at the rear of an angle pole.