Kreg Coarse Thread Maxi-Loc Screws are recommended for softwood and man-made sheet materials. Standard length used in 3/4" stock is 1-1/4"; 1" for thinner stock, 1-1/2" for thicker. All screws use #2 square drive bits. Box of 50. Kreg Fine Thread Maxi-Loc Screws are recommended for use in hardwood.