For straight tubes 1 3/4" - 3"(45-76mm) I.D. or
For curved tubes 2 1/2" 3"(64-76mm) I.D.
Flex Hub Tools incorporate centrifugally activated blades for removing hard and heavy deposits in straight or curved tubes. A drill GTC-229 can be attached to the front of the GTC-227 Flex Hub to clean severly clogged tubes. **Search Accessories for GTC-229 and replacement blade set GTC-227A**