Made from steel. carbon steel for life. Complete hole drilling and tapping in one operation with power drill saves labor and time Features wide spiral flute, which allow the chips to out of the hole, preventing chip crowding and breakage of tap drill bits. High quality hex to strong connection to drill chuck. Back tapered beyond tap to prevent thread damage from over-drilling Precision ground point, , body, clearance, and drill diameters for the best accuracy and performance Ideally suited for on-site tapping construction, maintenance and repair, assembly and production environments. Colour:silver Material:steel Size:5.59x4.5x0.03inches Package Contents: 5X x 0.5 Metric Drill Bits Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.