1. The type and specification of the word screwdriver are expressed as the total width of the cutter head * boring cutter.For example, 2×75mm indicates that the overall width of the cutting head is 2mm and the length of the rod is 75mm (non-total length).

2. The type and specification of the cross screwdriver are expressed as the size of the cutter head * boring cutter.For example, 2#×75mm indicates that the cutting head is no. 2 and the length of the metal rod is 75mm (non-total length).Some manufacturers express 2# in PH2, which is the same thing.You can approximate the size of the boring cutter to the size of the head, but the industrial production to the size of the head to distinguish.The size of metal rod matching 0#, 1#, 2# and 3# is approximately 3.0mm, 5.0mm, 6.0mm and 8.0mm.