Specification: <1>Package Quantity: 450 Pieces <2>Material: Brass, Nickel Plated Steel, Black Zinc Plated Steel, Fiber Paper <3>Type: Thumb Screw, Fan Screw, CD-ROM Screw, Hard Drive Screw, Mainboard Screw, Brass Standoffs, Brass Spacer, Main board insulation gasketFeature: <1>Made of high quality brass, steel and fiber paper, steel with nickel and black zinc plated, which have superior rust resistance and excellent oxidation resistance. <2>Whether you are a PC building hobbyist or a professional tech, this set of replacement screw accessories is a necessity and the quantity should last for several projectsPackage included: <1> Thumb screws 6#-32*6---------------------------10 Pieces <2> Thumb screws 6#-32*6---------------------------10 Pieces <3> Brass standoffs screws M3 x 6 + 6--------------20 Pieces <4> Chassis fans retaining screws M5 x 10----------30 Pieces <5> Main board washers M3 x 8---------------------100 Pieces <6> CD-ROM set screws M3 x 4-----------------------30 Pieces <7> Hard drive screws 6#-32*5----------------------30 Pieces <8> Steel standoffs screws 4#-40*5+7---------------20 Pieces <9> Chassis fans retaining screws M5 x 10----------30 Pieces <10> Chassis high-strength screws 6#-32*6----------30 Pieces <11> M3 x 6mm Brass standoffs----------------------20 Pieces <12> Flat head hard drive screws 6#-32*6-----------30 Pieces <13> Flat head hard drive screws 6#-32*6-----------30 Pieces <14> M3 x 4.8mm screws for 2.5" SSD----------------30 Pieces <15> Main board fixed screws M3 x 5----------------30 Pieces Package Quantity: 450 Pieces Warning: small parts, keep away from children and kids.