spring steel strip GuangWeiYouLiang`s spring steel strip is well-know for these applications. ---Springs(flat shutter door spring, toy springs, clips), ---Saw blade(hacksaw, band saw, mower cutting saw, wooden cutting saw), ---Building tools(scraper, mud trowel blade), ---Stampings, clips,hose,clamps,ceiling plaster hooks, Heat treatment with processes of cold rolled, queanched and tempered to meeting requested of hardness(HV),flexibilty and durable, antifatigue. we can change steel strip of color into blue,bright, yellow, black, etc. and ---Edge: slit, round, squre edge, one side round the other side square, ---Hardness: 40-52Hrc ---Size: 0.15-3.0*8-300mm Material grade spring steel strip C :0.42%~0.95% like ck45, ck50, ck60, ck67, ck70, ck75, ck80, ck85, ck90,