One end connects tightly to any tool with a 4" dust port, while the other fits perfectly into the Dust Right™ Handle (which connects to 4" hose and, ultimately, your dust collector), allowing you to move dust collection from tool to tool like never before! The Ports feature a flexible rubber boot on one side that guarantees a tight connection and allows for slight variations in the size of the tool's dust port. Includes two ports and two metal hose clamps.