Why are these sockets almost perfect?

What happens here

This video provides an in-depth overview of Koken Tools, a Japanese manufacturer known for its high-quality sockets and ratchets. It showcases several innovative product features, including a redesigned ball-holding groove for increased socket stability, the non-magnetic Nuck Grip socket for secure fastener retention, the compact Z-Series line, and a unique 72-tooth ratchet mechanism designed to prevent skipping. The presentation also highlights Koken's commitment to quality through its cold-forging manufacturing process and introduces versatile Wobble Fix extensions.