With the special FZUB drill bit, the hole for the anchor is drilled in one step and without the need to change tools, while at the same time creating a back cut. The drill is designed for mounting rear cut anchors FZA, FZA-I, FZA-D and FZEA II. After installation in the hole, the anchor is activated with FZE Plus. The casing hits the spacer cone, fills the back cut of the hole and creates a form lock. Special drill bit for creating a back-cut hole in concrete for the correct installation of fischer back-cut anchors Zykon FZA, FZA-I and FZEA. The drill bit is equipped with a swing emphasis for making a tapered hole in accordance with the approval.