HMT HSS Silvermax Tapping Size Weldon Drill InsertFoam Set 5.0, 6.8, 8.5, 10.2mmHSS XE twist drill bits with integrated 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 in thick steel has been a long and time consuming job in the past, fitting the SilverMax Weldon Shank Twist Drills into a Magnet Drill can suddenly make the job far quicker and safer than struggling with a Pistol Drill and jobber drills.