- 1/2″ wide Nylon construction wheel
- Replacement wheel for Backer Rod Insertion Tools: 640-4 Road Model or 640-5 Standard Model (sold separately)
- Quickly sets backer rod up to 1″ deep in saw cut joints
- For setting rod deeper up to 2″, use replacement wheel 640-G20.
- Additional sizes available:
- 640-G02 = 1/8″
- 640-G03 = 1/4″
- 640-G04 = 3/8″
- 640-G05 = 1/2″
- Also available in durable Aluminum








