Powerbuilt hex bit sockets feature sockets that use a 2 piece press-fit design for strength and durability. Socket bodies are constructed of Chrome Vanadium Steel and mated to S-2 industrial-grade steel bits. The patented Zeon design allows for protective non-slip function preventing bolts from striping while at the same time functions as a damage bolt removal tool. The unique design uses a spiral hex design that bits more the harder you push and turn.