While applying the fasteners (dowels) used in exterior thermal insulation applications, a hole is drilled in the vehicular and the dowel is placed in this hole and the nail is nailed, and the application is completed. At the end of the application, the head of the thermal insulation anchor with the parachute cap forms a thickness of 2 mm on EPS and XPS. Applications prevent this thickness. A certain minimum of 3 mm and 4 mm countersinking on EPS or XPS ensures that the application is stable in healthy plaster consumption. In places where countersunk is not opened, many blows are hit on the dowel, causing damage to the fastener and creating crookedness in the plates, resulting in higher plaster consumption, plus The labor cost increases. Considering this situation, the countersink apparatus, which was put into production, is mounted by removing it from the back of each of the drill bits used thanks to its easy design. In the hole application, the countersink is opened during the completion of the hole process.