2set 50mm Double Ended Tamper Screwdriver Bits 6pc Set F5,6; PH1,2; PZ1,2 #702

Myself used 1 bit for 1 week job, nothing happen to the tip of the bit, very powerful. This screwdriver bit set is only suitable for manual job, not for Electrical Drills or Electrical Screwdriver. 2"/50mm length, 1/4"(6mm) shank.