.Include:(1、1.5、2、2.5、3mm) x20pcs; (3.5、4、4.5、5、5.5、6、6.5、7、7.5、8mm）x11pcs;（8.5、9、9.5、10mm）x5pcs; 1Pc 4-22mm step drill;

.Classic HSS construction with titanium coating gives our bit a very high surface hardness and corrosion resistance;

.The N-shaped speed helix split point starts fast and reduces drill walking;

.With a large size range our bits are guaranteed to meet all of your sizing needs for all DIY projects, household maintenance, and general building use.