This bosch hss step drill bit stock no. 2608597520 Offers a diameter range of 6mm to 30mm, striking an excellent balance between versatility and manageability for a wide range of professional applications. Well suited to electrical panel work, plumbing installations and sheet metal fabrication, it comfortably handles the mid-to-large hole sizes most commonly encountered on site all with a single bit. The split-point tip provides a clean, accurate entry point on thin materials without pre-punching, while the cnc ground spiral flute ensures vibration is kept to a minimum and chips are cleared efficiently for smooth, consistent results. Axial and radial relief grinding delivers peak cutting performance across every diameter step. Laser-marked figures in both spiral flutes remain clearly visible throughout the bit's service life, making diameter selection quick and straightforward. The 3-flat shank ensures a firm, slip-free grip in the chuck for reliable high-torque performance. Features and benefits: 6mm 30mm range delivers excellent versatility for everyday professional use split-point tip ensures precise, burr-free starts no pre-punching needed cnc ground spiral flute for minimal vibration and efficient chip evacuation axial and radial relief grinding for the highest levels of cutting smoothness hss construction for long tool life works best when used with coolant laser-marked diameter figures in both flutes for quick, durable reference 3-flat shank prevents slipping and p...