1.We manufacturer all kinds of woodworking tools, such as reversible knives, wood planers, wood drills, etc. 2.Grade K05-K30 Zhuzhou ZZ ... for 70mm drill: 33mm. 2. For drilling in solid wood, MDF, wood-based Panel. 3. We also provide special size drill upon ... use spray coating:(a) Heat-resisting, steady performance at high working temperature.(b) Anti-sticking,High sliding for better chip removal ...