Twist drill set .
1-13mm(Set) - Fully ground HSS with 5 percent Cobalt makes these ideal for drilling extra hard materials. 135 Deg Split point tip enables bits to bite workpiece quickly reducing the need for centre mark. Drills can be re-sharpened without affecting their performance. Supplied in metal storage case. Contents: 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13mm