The sheaves are constructed of MOS 2 Nylon with ball races for smooth friction free operation.

The side plates are 5 mm thick steel to provide an immensely strong construction.

The design has been tested to a stringent 10:1 ratio.

Please note that due to an unfortunate positioning of the bracket fixing bolts the 100 mm diameter pulleys can only be used with the bracket uppermost. All the other sizes below can be reeved either way.