Screw information including common types, head types, popular drives and a basic definition.

Screw Head Types
Common screw head types include: round head, flat head, pan head, oval head, truss head, and hex head.

Popular Screw Drives
The most popular screw drives include, Phillips drive, slotted drive, Torx (Allen) drive, hex drive and socket drive.

(Source :nutsandbolts.com)