For cutting large diameter holes for air conditioning pipes, fans, downlights and ceiling speakers.
Dust collection shroud for 100% dust free work when overhead drilling.
Diameter is adjustable from 51 mm to 178 mm in 6.4 mm steps.
Laser marked preset diameters at 51 - 178 mm.
Suitable for use on drywall (max. 25 mm) and ceiling tile. Not suitable for OSB wood boards.