The raw materials were made out by (1) M2(SKH9/SKH51) against Tin coating. (2) Wolfram.
Appearance size of dies : MA type 31.75x25.4x12.7. MB type 31.75x32x20.0. MC type 45x32x30.
Length of drill head : MA from L1-2.3 to 5.0mm, L2-2.8 to 5.8mm, L3-4.2 to 7.0mm.
MB from L1-2.3 to 7.0mm, L2-2.8 to 7.7mm, L3-4.2 to 9.0mm, L4-6.0 to 8.5mm. L5-8.7 to 9.5mm.
MC from L4-10.5 to 12.0mm, L5-13.5 to 15.0mm. L6-15.8 to 17.0mm, L7-17.8 to 19.0mm