All of the forties and fifties Chevy and GMC trucks have a special type of screw/bolt called a clutch head. When you are working on disassembling the bed of your truck you need the larger 5/16" clutch head screwdriver. When you are working in the cab all of the dash, doors and striker plates require clutch head screwdrivers - from 5/32" to 5/16".
If you try to take one these out with a regular standard screwdriver it just won't work. You will strip out the head and this screws up a good project.
The five piece set includes a magnetic handle and four bits: 5/32", 3/16", 1/4", and 5/16". This set will do anything related to clutchead on a Chevy or GMC trucks. We have also noticed that people who are working on Corvettes need these screwdrivers. Do you know about any other types of cars that require these clutch heads? Let us know and we'll add it in to our page.