Premium Material:High quality brass, steel, fiber paper, black zinc plated and steel with nickel. Offer superior rust resistance and excellent oxidation resistance. Widely Applications:Perfect for PC case, power supply, motherboard, hard drives, fan and floppy/CD-ROM/DVD-ROM drives fixed installation Package included:SSD screw,fan screw,Insulating Gasket,Standoffs,Thumbscrews,Hard drive screws,Motherboard Screws,High-Strength Screws,Screwdriver Storage Box :Each Model Of computer screws Is Placed In A Compartment And Clearly Marked, Making It Easy For You To Use And Store At Any Time, Easy To Find And Use. After sales Service: If there are any problems with our computer screws standoffs assortment kit ,please contact us and we would be very happy to solve your problems.You can contact us through Amazon's internal message?You can contact us through Amazon's internal message.