Screw - #8x1" Coarse Maxi-Loc 100/Box, CHOOSING THE RIGHT SCREW... We offer three thread types, two head styles and four different lengths to handle all pocket hole applications. The characteristics for choosing a screw are detailed below. A FINE-THREAD screw is used any time you’re driving the screw into a hardwood (i.e., oak, maple, walnut, cherry, hickory, etc.) The COARSE-THREAD screw has a larger thread diameter and provides greater holding power when driving a screw into soft material such as plywood, particle board, MDF, melamine, and pine. We also offer a HI-LO THREAD type which consists of two separate threads, one higher than the other that serves as a general purpose screw in medium hardwoods like poplar. Kreg Tool