25 Pack, 1/2" x 4", Galvanized Hex Bolts, Machine Bolts That Have Been Designed To Adhere Facing Materials To Prevent Shear Movement, Specifically In Wood To Wood, Wood To Metal, Or Metal To Metal Applications, Galvanized Grade 2 Hex Bolts Are Recommended For Most General Uses & Are Corrosion Resistant, Be Sure To Pre-Drill Any Holes & To Use Washers & Nuts That Are A Similar Grade & Finish.