This Sirius Cheese Head Machine Screw is an M4 x 20mm slotted fastener, manufactured from A2 304 stainless steel. The 20mm length provides a substantial thread engagement for M4 applications, suitable for fixing thicker panels, brackets and general fabrication work. The cheese head gives a larger bearing surface than countersunk screws, and the slotted drive is compatible with a standard flat-blade screwdriver. Features and Benefits: • A2 304 stainless steel construction • Corrosion-resistant, maintenance-free finish • Cheese head for increased bearing surface • Slotted drive for flat-blade screwdriver • Precision metric threads Specifications: Diameter: M4 Length: 20mm Qty: Pack of 1 Contents: Pack of 1