FAMAG Bi-Metal hole saw for roller shutter, HSS, without shank and pre drill

Special hole saw of HSS bi-metal to install roller shutters in window frames. Incl. hexagonal shank and pre-drill bit to place the hole saw in position. During the installation of the roller shutter you have to drill holes in the window frames for the belts. This was always an issue, but with this hole saw it is properly solved. Remove the pre-drill bit from the hole saw after the first cut. This reduces the cutting forces and it works much more easier. HSS Bi-metal 500 - 750 rpm