Talamex Head Head Head Screw CS M4 × 20 Slotted | 4BoatsSlotted countersunk screw in M4 20 mm size, suitable for marine and general fixings. M4 20 mm (4 mm 20 mm; 0. 16 0. 79 in) Countersunk head sits flush when fitted Slotted drive for standard screwdrivers Standard M4 machine thread (0. 7 mm pitch) Ideal for marine fittings, joinery and general fixings Check material and finish for corrosion resistance before use Verify length and thread compatibility with your fittings before ordering.