C clamp jaw - Made of 1.7 mm thick heat treated steel with a black oxide finish for strength and durability - Hard to bend or deform during compression - Ends of the C clamp are aligned in a straight standard line to prevent slipping during use Toolbox storage - Includes 5 adapters to fit different spring diameters and secure the spring for safe, easy compression - Kit contains 10 pieces in total, all neatly packaged and sorted in a box for convenient storage and transport Easy to use - Close the coil spring compressor until it touches the centre bar, then insert into the coil spring - Compress the spring for removal or installation, and only release compression once the spring is set for installation - Note: coil springs store significant energy and must be handled with care to avoid injury Function and compatibility - 5 adapters in different sizes to suit different spring diameters on most cylinder heads - Allows proper mounting of the spring and facilitates the use of the compressor Use scenarios - Automotive engine valve spring replacement or installation during engine service - Lawn mower, motorcycle, or other small engine valve spring maintenance - General cylinder head service in workshops where safe, adjustable spring compression is needed