Size:M5 x 30 mm (30 PCS) Product Specification Button socket cap screws feature a low profile, cylindrical head with a plain finish. The internal hexagonal drive hole, also known as a hex-socket drive, requires a hex socket wrench drive — commonly called an Allen wrench, hex key or Allen key driver — for quick and easy insertion. With its flush profile, button socket cap screws are ideally utilized in areas with little overhead or side clearance and suitable for light duty applications like machine assembly with removable parts and panels. Thread Diameter 5mm Head Diameter 9.5mm Head Height 2.75mm Screw Length 30mm Allen Hex Drive 3mm High Quality Stainless Steel 304 Package Included 30 x Button Head Socket Bolts/Screws Warranty Still Awake hardware has the highest quality on the market. Buy with confidence. Money back or exchange guarranteed.