... three principles we always offer to our customers. And indeed through these efforts, we've built long-term relationship with over ... steel, 40Cr, Cr-V steel,and S2 steel. 2.Available handle materials: PP, PVC, TPR and ABS. 3.Tip can be ... ,S1*100,S2*100,S2*150,S3*100,S3*150mm. Screwdriver