Heat treated and chrome plated.
Package comes with,
12 pcs 1/2″ Dr. sockets: 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 21mm, 24mm
1 pc 1/2″ Quick release ratchet handle, 72T
2 pcs 1/2″ Dr extension bar: 5″ (125mm) & 10″ (250mm)
1 pc Spark plug socket, 16mm
1 pc 1/2″ Dr. universal joint