HW0107 Valve Stem Seal Pliers removes valve stem seals on overhead camshaft engines.19700 Valve Holder commonly used when valve springs or valve stem seals are replaced. HW0107 Valve Stem Seal Pliers is made of high-quality steel, with high strength, wear resistance, corrosion resistance, oxidation resistance, and durability.19700 Valve Holder is made of a top quality rubber with brass fitting connections, resistant to high pressure, acid and alkali, corrosion and oil, kinks and abrasion.