Styrofoam cutters

I created this set of two cutters for needs of my house insulating works. One of the cutters cuts holes under pins and the second one cuts off cups to cover those pins. This method is the best way to:
- prevent from the occurrence of condensation of water vapor or frosting on surface of plastic pins,
- prevent from the occurrence of thermal bridges on the wall,
- prevent from the concavity and convexity on the facade,
- prevent from the ugly effect of "ladybug" on the facade.

Hole cutter cuts holes 20mm deep and with diameter 65mm.

To fix it on cordless drill it requries typical bolt and nut with M8 screw under 13mm wrench.