Goods description:

Impulse magnetic back porcelain, can be washed screwdriver, screwdriver, screws, etc. from any need to increase magnetic tools when the screw is difficult to pick up, just insert the screwdriver with a "+" word side magnetization, which 
Samples can easily pick up the screws.
Insert the screwdriver with a "-" word side, you can immediately remove the magnetism.
Powerful magnetic force, the effect could be retained for several months.