Package include: One M3 Brass Hex Spacer Screw Nut Assortment Kit M3 Standoff Screw Nut total 200 pieces. Come with the plastic box: List(Type,Length / Thread,Quantity): Brass Male to Female Standoff 8mm+6mm, M3 10pcs Brass Male to Female Standoff 12mm+6mm, M3 10pcs Brass Male to Female Standoff 15mm+6mm, M3 10pcs Brass Male to Female Standoff 20mm+6mm, M3 10pcs Brass Female to Female 8mm M3 10pcs Brass Female to Female 12mm M3 10pcs Brass Female to Female 15mm M3 10pcs Brass Female to Female 20mm M3 10pcs Stainless Steel Screws M3 x 6mm 80pcs Stainless Steel Nuts M3 40pcs Packing contents: 200pcs M3 Brass Standoff/Stainless Steel Screw/Nut Assortment Kit. M3 Brass Hex Standoff spacers/ Stainless Steel Screw / Nuts Assorted Kit Total 200 pieces,Come with the plastic box Screw thread:M3/(3mm),Thread pitch:0.5mm;M3 standoffs-hex size:4.7mm.Male length:6mm;Female lengths:8mm to 20mm. The M3 Brass Male-Female Standoffs have different sizes:8mm+6mm(10pcs);8mm(10pcs);12mm+6mm(10pcs);12mm(10pcs);15mm+6mm(10pcs);15mm(10pcs);20mm+6mm(10pcs);20mm(10pcs),with M3*6mm Stainless Steel Screws(80pcs)/M3 Stainless Steel Hex Nuts(40pcs);Total:200PCS M3 Standoffs are made of Brass, M3 Screws and Nuts are made of 304 Stainless Steel,Steel Great corrosion resistance for outside applications; M3 Standoffs Kit For FPV Quadcopter Building,Arduino,PCB,Raspberry-Pi or other projects.Easy to install