HANS Tools Specilize in making wide rang ISO-DIN Professional / industrial HAND& IMPACT Sockets From 1/4 -1.1/2Dr.4mm to 150mm / SAE to 6.1/2 / Short / deep / 6Pt / 12Pt /Driver B
This product is in a strong steel character. Made by CRV-6140 material and had been through the process of high temperature for hardness. It's a marvelous quality of product.
Jo