Trend SNAP/IT20/10 Trend Snappy 25mm bit torx T20 ten pack25mm Torx Insert Bits 10 PackA pack of ten 25mm Torx insert bits High grade chrome-vanadium steel, through hardened to hardness HRC 59-61 and precision machined to exacting standards of accuracy.Suit all types of screw applications in trade and industry.Use on manual and machine applications.High wear and tear resistance for a long tool life. Optimum fitting in DIN screws for high torque transmission.For use with insert bit holder.Specification-OL=25 mmSize=Torx T20d=3.86 mmShank Diameter=1/4 inch hexHardness=HRC 59-61Suitable for=M4 machine screwSuitable for=4.2 mm (No.8) self tapping screw