Hex Cap screws are bolts with hexagonal heads and machine threads for use with a nut or in a tapped hole. Grade 5. Heat-treated zinc finish for extra strength and wear resistance. Tighten with a wrench or drill. Nuts not included. Diameter: 3/4 In. Length: 2-1/2 In. Finish: Zinc Threads Per Inch: Grade: 5 Material: Steel Head Type: Hex Cap Thread Type: Coarse Thread Size: 3/4-10 Nut(s) Included: No