We have many kind of screws, such machine screws, selftappping screws, wood screws,
socket set screws, drywall screws and special screws. Each type of screw has its own
subcategory and each screw has its special function, so does its subcategory screws.
The most commonly used screws is as follows, Philips screws, PhilSlot screws,
Hex Socket screws, One way screws, Head Code screws, Flat screws, Oval screws,
Round screws, Pan head screws, Truss screws, Hex screws etc.