HSS High-speed Steel 4241 Hole Chamfer Cutting Drill Bit Tool Set - Golden (4 PCS)
2-5: for drilling 2~5mm holes shaft: 6mm head diameter: 9.7mm; 5-10: for drilling 5~10mm holes shaft: 8mm head diameter: 14mm; 10-15: for drilling 10~15mm holes shaft: 10mm head diameter: 21mm; 15-20: for drilling 15~20mm holes shaft: 12mm head diameter: 28mm; Round shaft; Suitable for the plates with hardness lower than 25' such as carbon steel plates thin metal plates insulating plates PVC plates.