... 4:HRC 46-49 Cold rolled, high carbon ,hardened and tempered spring steel strip 1. Material : 50# 65Mn2.Color: black ... woodworking band saw, automatic clutch patch , reeling shutter spring steel strip, horologe clockwork spring ,shoes material ,hook material, spin ... ,standard stamping ,packing strip, and other industrial-used steel strip.Package: oiled, plastic film inside, sackcloth ...