Dottie Machine screw with Phillips/slotted drive, measures 3/4-Inch x 1/4-Inch Dia. This screw has sturdy steel construction and zinc-plated finish for greater resistance against corrosion. Round head machine screw projects above the material surface. It has size 1/4 - 20 type UNC threads. It is perfect for use in the applications where clearance is not an important factor.