The do-it-all fastener with 3,000 lb of shear strength that will install 10 times faster than lags and doesn't require pre-drilling. They just zip right in! No more sledge hammers or damaged wood. Timberlok will countersink into the beam; draws down warped beams; is removable; has 2" of thread with 1/4" major dia.; has unmatched corrosion resistance. Drive the Timberlok in using a standard 1/2" power drill (a 5/16" driver bit is included.) Engineered for landscaping, post and beam work, retaining walls, carrying beams, exterior decks, fencing, railings, LVL beams, headers and many more wood to wood applications. You name the job and Timberlok will help you do it faster. Made in the USA. Priced per box of 50 pieces.4" length, 2" maximum beam width.