1/4-20 x 1-1/2" (25 pcs) Button Head Socket Cap Screws Bolts Alloy Steel 10.9 Grade, Black Oxide Finish, Full Machine Thread

Allen Hex Drive Size: 5/32" (0.156"), Thread Size：1/4-20; Thread Type: 20 TPI Coarse Thread (UNC); Thread Style: Right Hand, Screw Length: 1-1/2 inch or 38mm (measured from under the head); Diameter of the head: 0.437 inch (max); Height of the head: 0.132 inch (max);, The high quality 10.9 grade alloy steel provide perfect strength and good corrosion resistance., Button head style make it ideal use in confined areas and offer clear looking.