For precision-drilling through hollow sections! ̈ Ideal for drilling in hollow sections like window frames or sheet metal sections ̈ Ideal for drilling through composite materials made of insulation, steel core, plastic and wood ̈ Drill bit is very robust thanks to the short spiral ̈ Precise point cut guarantees good advance Sandwich panels Non-ferrous metals Beams Softwood Sheet metal Plasterboard Insulating materials Plastics Sizes: Diameter 3.0 mm - 5.9 mm Total length 100 mm - 210 mm Cylindrical UNIVERSAL & SPECIAL DRILL BITS 917 HSS-G Hollow-section Twist Drills ! Perfect for roofing applications 27