Perfect for sweaton ribs ramps sights etc. Parts can be blued after soldering. Fast easytoapply paste fluxes tins solders in one operation no dripping. Works on copper brass steel all common metals and some stainless steels. Mfg: Hercules Chemical SPECS: Tensile strength 10 000 psi. Melting point 464and176; F. 95 tin 5 antimony.