These Shrinking Discs work on aluminium and steel and the secret to them is that they create heat through friction when spinning and touching the metal. When the area is cooled by either a squirt of soapy water or compressed air the heated area cools and shrinks. Discs are available in 2 sizes, 230mm and 125mm. This one is the larger one suitable for use in a 7″ or 9″ grinder or sander.
PLEASE NOTE: You will need to supply a rubber sanding disc to suit your grinder as backing support and attaching nut for the disc, these are included if you purchase the KIT also listed.