Draper Expert HSS Metric Tap Drill Bit

The 4.2mm Draper Expert HSS Metric Tap Drill Bit is specifically sized for drilling pilot holes before using 5 x 0.8 metric taps. Measuring 4.2 x 75mm overall, this drill bit sits in the mid-range of metric tap drill sizes, making it ideal for general engineering and mechanical repair work. The single drill per card format reflects the robust nature of this size for regular workshop use. This size is particularly popular for automotive applications, machinery maintenance, and general fabrication work where 5mm metric threads are commonly required. The high speed steel construction provides excellent wear resistance and maintains sharp cutting edges for consistent hole quality.