The head is designed with an oblique angle which is conducive to chip removal and has good opening effect This product is perfect for those who want to open holes in their models without damaging It is a manual model hole expander that can be used for opening holes in model shells or carbon plates It is suitable for aviation model drilling, woodworking, and model enthusiasts This model hole expander cone comes with a sleeve that can fully protect the expander and the drill tip from being damaged when it falls, Manufacturer: uikios