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Safe use of the screwdriver(1)

Update:23 Feb 2019
Summary:

The screwdriver should also be intact, the shape of the […]

The screwdriver should also be intact, the shape of the handle clean, smooth and crack-free handle should be easy to grasp and the handle should be correctly, vertically and firmly mounted on the handle. The flat side of the wire cutter head should exactly coincide with the groove above the nail head. Screwdriver knife
 
The head end line should be at right angles to the shank.
 
In addition to the shape of the cutter head, all of the above requirements also apply to the crosshead type screwdriver.
 
The cooperation between the cutter head and the screw head of the screwdriver must be appropriate. The improper cooperation between the two is one of the main causes of the common accident of the screwdriver.
 
For ordinary single-slot screws, the screwdriver should enter the screw slot vertically, with almost no shaking.
 
Use a screwdriver of the largest size and the right length that fits flush into the screw slot.