This model hole expander cone comes with a that can fully protect the expander and the drill tip from being damaged when it falls. The head is designed with an which is conducive to chip removal and has good opening effect. 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 product is perfect for those who want to open holes in their models without damaging .