To prevent bolt or screw from lost or fall

My experience when repairing of electronic devices, computers, laptops, smartphones, etc. which have  bolt, nut, or screw with small size, often have the incidence of lost or fall,

It doesn't happen again now, after I have the magnetic band for placing the screws, nuts, or bolts.
called Magnetic J watch from Jakemy.
Non magnetic screwdriver will be the magnetic screwdriver by putting/touching it to this tool.  

If you interest, you can search and buy from online store like, the price is about US $5.