Detailed Product Description Model: BK 638-7 Renewable Screwdriver SetMade of original S2 steel, High-quality, hardness about 58HRCApplicable to families, and industrial applications.~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Existing specifications:BK 638-7A: Cross +PH1 +PH2, Slotted -5 -6, Six edge-type 4 5 6.BK 638-7B: Cross +PH0 +PH1 +PH2 +PH3, Slotted -5 -6 -7.BK 638- ...