Package includes - 12 pieces valve spring compressor set - 1 solid valve spring compressor including 1 wide C-clamp, 3 extension screws, and 5 pusher adapters in 5 sizes, and 1 hand level - 2 valve lappers - 1 hard plastic storage case for easy carry, safe storage, and quick organization Valve spring compressor - Forged steel construction provides high strength and hardness to prevent bending or twisting under the stress of compressing valve springs - Oxide finished surface delivers rust- and corrosion-resistance - Designed for longer service life and reliable performance Practical size and compatibility - Multiple adapters and pushers to fit different valve requirements - Valve sizes supported: 16 mm OD, 19 mm OD, 25 mm OD, 30 mm OD - Includes a hard plastic storage case for convenient transport and organization Valve grinding lapping stick - Aids in matching valve seats during engine top-end rebuilds - Helps clean carbon deposits from valve seats - Hardwood long easy-grip handle for better control, reducing fatigue and increasing productivity - Rubber grinding head is easy to use and wear-resistant Applications and use scenarios - Safely removing and compressing valve springs during routine valve maintenance on automotive or light machinery engines - Selecting the correct adapter and pushers to accommodate valves of 16, 19, 25, and 30 mm OD during valve service - Rebuilding top-end assemblies by lapping and seating valves, and cleaning carbon deposits on valve seats for improved seal and performance