1.[Package Includes] 12pcs valve spring compressor set contains everything you need to remove and compress valve springs: 1pc solid valve spring compressor including 1pc wide C-clamp, 3pcs extension screws, and 5pcs pusher adapters in 5 sizes and 1pc hand level, 2pcs valve lappers. Practical set for easier work. 2.[Valve Spring Compressor]Each component is made from forged steel which guarantees superior strength and hardness, so that our C-Clamp will not bend or twist under the stress of compressing valve springs. Compressor surface is oxide finished for rust- and corrosion-resistance. Quality material for longer life. 3.[Practical Size]Multiple adapters and pusher can meet your different auto mechanical needs. Valves for the Following Sizes: 16mm (OD.) 19mm (OD.), 25mm (OD, 30mm (OD.). Also with hard plastic storage case for easy carry, storage, and quick organization. 4.[Valve Grinding Lapping Stick]This tool set helps matching valve seats during the engine top-end is rebuilding. Suitable to aid in cleaning of carbon deposits off valve seats. Hardwood long Easy-grip handle for better control, less fatigue and more productivity. Rubber grinding head is easy to use and wear-resistant.