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10pcs M3 M4*8MM/10MM Aluminum alloy colorful knurled thumb screws computer chassis side panels DIY knurled hand tighten screws 10pcs M3 M4*8MM/10MM Aluminum alloy colorful knurled thumb screws computer chassis side panels DIY knurled hand tighten screws 10pcs M3 M4*8MM/10MM Aluminum alloy colorful knurled thumb screws computer chassis side panels DIY knurled hand tighten screws