This Altex Preferred MFG 345-Piece 15 Size M3/M4 Nylon Round Spacer Assortment Kit is perfect for a variety of applications. This kit features premium nylon material, comes in a 15 size assortment, and includes a reliable plastic storage box with size labels. It is lightweight, rustproof, stable, and insulated, making it a durable option for any project. This kit is perfect for electronic products, automotive manufacturing parts, machinery, toys, and more.