Type: Thumb Screw, Fan Screw, CD-ROM Screw, Hard Drive Screw, Mainboard Screw, Brass Standoffs, Brass Spacer, Main board insulation gasket. Main board brass standoffs screws (M3 x 6 + 6) : 30 Pieces. Product content: There are a total of 10 different types of computer motherboard screws and hanging pins.