00pcs M2 M3 M4 Plastic Nylon Hex Male Female Spacer Round Head Screw Nut Single

Thread pitch: 0.4mm (M2) / 0.5mm(M3) / 0.7mm(M4). Thick: 1.8mm (M2) / 2.7mm(M3) / 3mm(M4). M3 L(spacer length) + 6mm(outside thread length). thread pitch: 0.5mm(M3). M3 L(spacer length). Female spacer.

eBay