Allen Hex Drive Size: 3/16 inch (Included a hex wrench); Package Contents: 30 PCS Thread Size: 1/4-20; Thread Pitch: 20 TPI; Head Diameter: 0.37 inch; Head Height: 0.25 inch Feature: The cylindrical head hex socket cap screws ensures a snug fit in pre-drilled holes, ideal for furniture assembly, TV mounting brackets, audio equipment and home entertainment fixtures; Its slim profile allows for concealed installations without interfering with adjacent components Material: The screws are made of 304 stainless steel 18/8; Excellent toughness; Good corrosion resistance; High strength and durability; Heat Resistance Packaged with Hex Spanner: Each set includes a handy hex spanner for on-the-go adjustments; of course you can choose your tool box standard hex keys and wrenches for easy handing 1/4-20 x 5/8" Socket Head Cap Screws (30 pcs), 304 Stainless Steel 18/8, Allen Hex Drive, Home Entertainment Furniture Screws, Fayeploo (with Hex Spanner)