The 3-piece drilling aid set from wolfcraft is the first safe standard solution for the clean and centred enlargement of existing drill holes with a hole saw. The high-quality 2-component box contains 3 drilling aids: The drilling aid for existing hole dimensions of Ø 35-51 mm can be used with hole saws from Ø 60 mm, the one for existing hole dimensions of Ø 46-62 mm with hole saws from Ø 68 mm and the one for existing hole dimensions of Ø 54-70 mm with hole saws from Ø 76 mm. The set also includes an insertion aid and 3 steel drill bushes with Ø 6, 8 and 10 mm, which you can install to match the Ø of the centre drill of your hole saw. This clever innovation consists of a high-quality tapered plastic cylinder that you simply screw into the existing hole using the integrated thread. In the centre of the drilling aid is a steel bushing that accepts centring drills with Ø 6, 8 or 10 mm and thus guides the hole saw securely. The centring aid also guarantees centred alignment with the existing hole. This allows you to maintain an even hole pattern when drilling series holes, e.g. when converting halogen ceiling spots to a larger LED system. With this set, you are equipped for existing drilled holes from Ø 35-70 mm - ideal for professional use. Use the included insertion aid to retighten the seat in the drill hole so that the drilling aid is firmly fixed in the drill hole. Simply insert the hole saw, drill and then remove the drilling aid with the drill core. You can also use the drilling aid for overhead employees.