8.6mm Dormer (A100) HSS Jobber Drill Bit Dormer A100 Jobber drill bits are a general purpose, HSS (high speed steel) drill bit which are suitable for the majority of general purpose engineering applications. They have an excellent self-centring capability of a range of different materials and are suitable for hand and machine use. The A100 Drill bits have a 118 degree point, steam oxide finish and conform to DIN 338N. These Dormer Drill Bits are made from High Speed Steel (HSS). For larger quantities or items not listed, please email and one of our team will provide you with a quotation. 8.6mm Dormer (A100) HSS Jobber Drill Bit