I used these for my keyboard case from 1upkeyboards which uses M3 screws and female/female standoffs. They fit perfectly. Use a small flat head screwdriver. You get a lot of pieces for a small amount of money.
20Set M6 Stainless Steel Hex Head Screws Bolts And Nuts Flat &Amp
3 Review
280 Piece Grade 12.9 Alloy Steel M3 Hex Socket Cover Head Bolt Screw Nut Assortment Kit with Storage Box - Includes Lengths 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 16mm, 20mm, and 25mm
3 Review
79-Piece Assortment Kit Of #6 To #12 304 Stainless Steel Sheet Metal Screws With Oval And Pan Heads By T.K.Excellent
3 Review
K Kwokker 1083PCS Stainless Steel Metric Bolt Assortment Kit: M2, M3, M4 Screws, Nuts, And Washers - Hex Socket Head Cap Machine Screws, Bolts And Nuts In Silver
18 Review