M4 x 18mm Slotted Countersunk Screws (DIN 963) - Brass Slotted Countersunk Machine Screws feature a flat head and a slotted drive. The slotted drive is the simplest form of screw drive which is designed to be used with a Flat Head Screwdriver, whilst the flat head is designed to lay flush with the base material. Machine Screws are massively versatile as they are available in a wide variety of head styles and drive types. These Slotted Countersunk Screws are made from Brass which offers both high tensile strength and high corrosion resistance. For larger quantities or custom lengths, please email and one of our team will provide you with a quotation. M4 x 18mm Slotted Countersunk Screws (DIN 963) - Brass