DescriptionCreate hole and threads in a single pass. No center drilling or punching required. Set includes 5 pieces - 4x.7, 5x.8, 6x1, 8x1.25, 10x1.5ApplicationIdeal for use in multi-spindle heads with reversing capability and in RotoBrute variable speed/reverse magnetic drills when used with tapping heads. Create holes and tap in a single operation. No center drilling or punching required.