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【Durable Construction】Crafted from heat-treated solid steel with black-oxide coating for maximum strength, corrosion resistance. 【Valve Lapper Set】Mainly used for hand lapping valves, cleaning and removing carbon deposits on the valve, keeping devices work efficiently. 【Practical Size】Length of Collets: 1-3/4", Max Jaw Opening: 9-1/2", 5 Adapters in 16, 19, 23, 25, 30mm, Valve Lapper: 205mm/230mm. 【Wide Application】Used to easily compress valve springs for removal or installation on most cylinder heads, fit for most cars, vans, small marine engines and motorcycle engines. 【Convenient & Portable】Comes with a plastic carrying case, easy for transport, storage and quick organization.