FEATURES:

40mm is the minimum size could cut in all circle cutting hole saw.
Multi-function circle cutting hole saws with adjustable cutters.
For cutting circles in roofs, walls and floors. Pick up the chips.
Realice cuts in plywood, chipboards, gypsum, acrylic plates, lead, blackboard, coverings, etc.
For cuts in aluminum, brass, sheet metals up to 1mm thickness.