This lot contains 40 3/8 x 16 Unistrut spring nuts made of durable steel material. These nuts are perfect for use in various industrial applications, including fastening and hardware. The thread size is ideal for use with 3/8 x 16 screws, making it a versatile choice for businesses and industries. The Unistrut brand is known for its quality and reliability, ensuring that these spring nuts will provide secure and long-lasting performance. Whether you're in need of fasteners for a construction project or simply looking to stock up on supplies, this lot is an excellent choice.