See pic for boom length

but different from

RPM: 0 - 450

simply rub the stick over the damaged area or heat the stick with a flame and fill the area with hot wax

run a wire from each machine to the junction of the ductwork

125mm Soft Backing Pad 2608601714 by Bosch Epoxy See pic for boom lengthFine grinding with an angle grinder requires a backing pad thats durable, flexible, and resistant to heat. Like the PRO Backing Pad. We designed the PRO Backing Pad for grinding with fibre discs of P60 grit and above. We made it from durable, heat resistant plastic to make sure you can grind your workpieces effectively time and again. Max Speed: 12,250 rpm Backing Pad Type: Soft Diameter: 125mm