- 4280D is used to cut four grooves, 3/4" (19mm) apart and 1/4" (6mm) deep and an edge radius of 1/2" (13 mm)
- C reates a safety tread effect on steps
- F orms a 1/2" (13mm) or 3/4" (19mm) radius and a 1/4" (6mm) groove in one pass
- Groove is 7" (178mm) from outside edge where marked with a *
