Raspberry Pi 3 Model B / 2B Hat M2.5 (11mm body + 6mm screw) Hex Brass Standoff Cylinder + Screw + Nut Kits Durable brass standoffs, stainless steel screws and nuts which strong, anticorrosive, compact and portable Packing List: 24 x Brass cylinders (M2.5 x 11mm body + 6mm screw); 24 x Screws ( Pm2.5 x 5) ; 24 x Nuts( M2.5);