SZ-1A Hand held cold welderscrew extractor screwShengzao Metal defectShengzao PXKS-350 UtrasonicShengzao SZ-3TR coldscrew extractor screwShengzao Metal defectShengzao PXKS-350Shengzao SZ-3TR coldSZ-1A Hand held coldscrew extractor screwShengzao Metal defectShengzao PXKS-350Shengzao SZ-3TR coldSZ-1A Hand held cold