Double Socket Button Head Screw M4x16mm (10)These high quality Double Socket Screws will provide direct replacements for your kit supplied items. Includes 10 x M4x16mm Double Socket Button Head Screw Features Precision manufactured for consistent fit and easy set up adjustments These screws feature a 2. 5mm hex on one end and a 2. 0mm hex on the opposite end allowing fit and removal from either end Supplied in packs of 10 so you always have a spare M4 x 16mm (Metric 4mm Diameter x 16mm Length)