Hultafors Craftsman"s RFR Knife is developed and adapted to meet the needs of craftsmen, with a blade made from stainless Japanese knife steel. It features a unique function for attaching the holster around a button on your work clothes so that it does not come loose whilst still being easy to remove. The blade is made from 2.5 mm stainless steel that has been hardened to 57-59 HRC.