This Amtech 3 piece universal joint set is perfect for any DIY enthusiast or professional mechanic. The set includes 1/4", 3/8", and 1/2" sockets that are compatible with a variety of different nuts and bolts. The sockets are made from high-quality materials and come with a 1-year manufacturer warranty. The I6350 model is a reliable and durable option for those who need a socket set that will last. The universal design allows for use with a wide range of different nuts and bolts, making it a versatile tool for any project. Whether you're a professional mechanic or just starting out, this Amtech socket set is a great choice. Set includes 1/4", 3/8" and 1/2" drive. Locks onto ratchet or extension bar. Drop forged steel.