Dottie DDFW10114 - #10 x 1-1/4'' Square Drive Flat Head Wood Screws are made of Carbon Steel with a Zinc Plated finish. Featuring aggressive threads for a high grip strength, they are ideal for Plywood, Lumber, and other Woods. The screws provide a flush surface, have a thread pitch of 13 TPI, and come in a pack of 500. With a flat head, gimlet point type, and square drive type, these screws have a head diameter of 0.385'' - 0.340'' and a head height of 0.116''. Driver size required is #3.