UNIKA UR21 ST shank for composite materials, large diameter (ventilation fans, air conditioners, etc.)

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.
Complete set including center drill, body, and shank assembly.
The body can be easily replaced without tools, and can be easily attached and detached with one touch.
The shank is common, so by replacing the body and center drill, various types of holes can be drilled.
The specifications have been changed so that a safety cover that was not possible to install on previous models can now be attached.
Metal siding boards, plywood, FRP, PVC boards, thin steel plates/aluminum (2mm), galvalume steel sheets, ceramic siding boards, ALC boards, gypsum boards, stainless steel sheets (1mm)