Wood screw is to fix for thinner pieces of wood. Point tip and steeply angle thread are the feature of the wood screws that make for drilling and gripping the wood fibers. The thread with variety choices depend on the hardness of wood. Hardwood with finner thread and softwood with coarser thread. It also have blank shank underneath head part is to create tighter connection.
S=M2.6~M8,
#3~5/16 L=9~300mm,
3/8"~12"
Type 17
Willy Point