UNIKA UR21 Ventilator Set (110/160) for Composite Materials

The dual blade set with the inner blade leading allows you to drill holes in metal-clad siding, stainless steel-clad wood, and composite materials such as [metal plate + insulation + plywood] in one shot.
When drilling holes in wood-based materials, cutting chips are easily removed, and it is also possible to cut nails and cut thin steel plates in layers.
One shank allows easy exchange between 110mm and 160mm body sizes.
Simply turn the tightening ring to firmly set the body.
The wide contact area efficiently transmits rotational force.
The flange part is made lighter by using a new material (high-strength aluminum alloy) that is lightweight and rust-resistant.
The centre drill also has a one-touch attachment/detachment mechanism.
Metal siding boards, plywood, FRP, thin steel plates / aluminum (2mm), 2x4 (can also cut nails), PVC boards, gypsum boards, stainless steel plates (1mm)