Faithfull Professional Jobber Drill Loose 10. 50mm Faij1050pro. Designed to meet the requirement of the professional user, these drill bits are manufactured from M2 grade steel and are fully ground to meet the requirements of DIN 388 and feature a 135 degree split point providing easy non-slip starting and precision drilling. Suitable for use in: Alloy Steels, Carbon Steels, Cast Iron, Hardened Alloy Steels, Stainless Steels. Diameter: 10. 5mm Faij1050pro. Material: Other Material.