1. The model number of the flat screwdriver is indicated as the width of the knife head * the shank. For example, 2×75mm means that the width of the cutter head is 2mm and the length of the rod is 75mm (not the full length).

2. The model number of Phillips screwdriver is indicated as the size of the cutter head * shank. For example, 2#×75mm, it means that the cutter head is No. 2 and the length of the metal rod is 75mm (not the full length). Some manufacturers use PH2 to represent 2#, which is actually the same. You can approximate the size of the head by the thickness of the shank, but industrially it is distinguished by the size of the head. The corresponding metal rod thickness of 0#, 1#, 2#, 3#, and 4# is roughly 3.0mm, 4.0mm, 6.0mm, 8.0mm, and 9mm.

The bold letter followed by a number indicates the slot number. For example: cross, PH1PH2, PH3

The above models have standards and gauges to test.

The common specifications of star type are: T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T15 T20 T25 T27 T30 T40 T45 T50 and so on; There is also a distinction between central and unaperated.