Fastap Interior Carpentry Screws have been engineered to save time with an easy, labor saving one-step installation that will make any project look great and stay tight for a long time. Fastap Carpentry screws utilize a unique 45 thread design that translates into more holding power. Originally developed for tough jobs like flooring, Fastap Carpentry Screws are perfect for all general carpentry jobs (like stairs and framing), making tight, secure fastening in restrictive spots (beneath flooring, wall cavities, etc.), where you could never swing a hammer, quick and practical. Great for soft materials like particle board or MDF.