With the Facom 229A.ST1 step drill bit, you drill precise holes from 4 mm to 20 mm without the need to switch tools. Crafted from high-speed hss steel with an overall length of 75 mm, this bit is ideal for working on sheet metal, electrical enclosures, or bodywork. You can start drilling immediately without a pilot hole, ensuring fast and clean results. The 8 mm cylindrical shank with 3 flats prevents slipping and stalling inside the drill chuck for solid torque transfer. Laser-etched markings in the groove let you clearly track your exact hole size while you work.