HMT HSS Silvermax Tapping Size Weldon Drill Set 5.0, 6.8, 8.5, 10.2mm HSS-XE twist drill bits with integrated magnet Weldon shank for simple and accurate drilling in steel and fast tool changing. Removes the need for using a separate drill chuck in a magnet drill. Where drilling smaller holes or tapping size holes has been a long and time consuming job in the past, fitting the Silvermax Magnet Twist Drills into a magnet drill can suddenly make the job far quicker and safer than struggling with a pistol drill and jobber drills. Removes the need for using tool chuck in a magnet drill; High quality ground flute 30mm Cutting length; 19.05 Weldon Shank; Fits all standard magnet drills