The Xingke Hardware Network understands that, in general, screwdriver common word and cross. Screwdriver models more than these two. But one thing is sure, the screwdriver does not round, because the Round of no torques. The word is to ensure that there are torques, while Cross make the force more evenly distributed.

Screwdriver power source manual screwdriver electric screwdriver. Batch of head or head word (FLATHEAD) and Cross (PHILLIPS). Specifications and model a variety of industry, which, basically for the first batch. Its size as well as two. A metric, that is, we often say in MM units. For example, the upstairs talking about those sizes. Some English, it is inches, for example, 1/4, 3/16, this figure is multiplied by 25, is the metric size.

1, slotted screwdriver models Arbor width × Arbor. For example, 3 × 75mm, the blade width of 3mm and the lever length of 75mm (non-full length).

2, Phillips screwdriver models for head size × Arbor. For example, 2 # × 75mm, said heads of No. 2, the metal rod length of 75mm (non-full length). Some manufacturers PH2 to 2 # actual. You can be the thickness of the shank to a rough estimate of the size of the head, but the industry based on head size to distinguish. Model 0 # 1 # 2 # 3 # the corresponding metal bar thickness roughly to 3.0MM, 5.0MM, 6.0MM, 8.0MM.