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Screws are just another way to fasten one piece of material to another. They are similar to nails, except have grooved sides, that help hold them in place. Just like nails, there are screws that work better for different jobs. Here is a list of different kinds and what they are used for. Keep in mind the same rules of size that apply to nails, apply to screws. You want a screw that will reach into the materials you want to hold, without reaching the opposite side.

a.. Flathead screw - This is a general purpose wood screw. The grooves do not reach to the top of this screw, you it can be driven flush with your wood, or sunk into it.

b.. Oval-head screw - This screw is for woodworking. It's head is oval and considered decorative so you can leave it protruding from the wood.

c.. Roundhead screw - The roundhead screw is strong and can be used on wood or metal. It's head is round, and can be left protruding from the material.

d.. Particleboard screw - This screw is made to drive through particle board. The sharp end and deep grooves cut through the thick glue in the particle board.

e.. Drywall screw - This screw is thin, but strong. It's made to cut into drywall, even studs.

f.. Sheet-metal screw - This screw is grooved its entire length. It's made to cut into and hold in sheet-metal. It's best to drill a starter hole before drilling this screw directly to the material.

g.. Lag bolt - The lag bolt had a hex-shaped head, so it can be driven into wood with a wrench. This is the strongest of wood screws.

h.. Dowel screw - The dowel screw is made for one purpose, adjoining wood at both ends. It has grooves on both sides so you can screw one end onto, say a table, then screw the leg of the table on the other end.

i.. Hanger bolt - The hanger bolt uses the same concept as the dowel screw, except one end has grooves for wood, the other end for machinery. This end will be fastened with a nut.