Used on high speed bench grinders usually with buffing compounds to polish metal. Sisal mops are the coarsest fibre similar to that in rope and act as a strong and aggressvie carrier for your choice of cutting compound.
Spare for Joint Genie dowelling jigs. Allows for more or less standard bar assemblies to increase the inward reach from the reference face on which the fingers bear. See also threaded rod - available in lengths up to a metre for extreme accurate...