Drain Cleaning Attachment, Head Type Chain Knocker, Compatible Cleaner Series Ridgid K9-204, Connection Size 5/16 in, Maximum Drain Line Inside Diameter 4 in, Minimum Drain Line Inside Diameter 4 in, Product Type Knocker, Compatible Cleaner Manufacturer Part Number 64273, Application Pipe Wall Cleaning, Cutter Length 4 in, Cutter Type Chain Knocker, Features For Hard-Walled Pipes, For Wipes, Scale, Roots and Soft Blockages, Fits Brand FlexShaft, For Use With K9-204 FlexShaft(R) Machine