... 250mm 4:HRC 46-49 Cold rolled, high carbon ,hardened and tempered spring steel strip 1. Material : 50# 65Mn2.Color ... products are used widely in tool & hardware,various mud trowel, shovel, woodworking band saw, automatic clutch patch , reeling shutter spring ... ,shoes material ,hook material, spin ,standard stamping ,packing strip, and other industrial-used steel strip.Package: oiled, plastic film inside ...