Ordering by number: this is C058979, the Chicago Pneumatic eccentric weight. It is a factory service part for the machines listed below.

If you are working from a machine rather than a part number, start at the parts diagram library, or send us the model and serial and we will match it. Machines themselves are on the Chicago Pneumatic lineup. Denver stock, with same-day shipment on in-stock orders in by 4 PM ET.

• Part number: C058979
• Manufacturer: Chicago Pneumatic
• Crowder SKU: CP-C058979