Introduction: This professional Valve Spring Compressor is perfect for removing and compressing valve springs on most cylinder heads more convenient. Ideal for use on most car, small van and motorcycle engines Function There are 5 different size adaptors suitable for various spring diameters on most cylinder heads. It allows you to correctly fit the valve spring and makes it more easier to compress Feature DurableMade of solid steel material, heavy duty construction, sturdy and durable.The oxide finish on the set components resists rust and corrosion. The surface finish of each part is smooth and provides for easy use under high compression. Easy to useClose the coil spring compressor until touching the center rod, and insert the compressor into the coil spring. Compress the spring for removal or installation and only release compression when the spring is set for installation. Compressed springs contain significant stored energy and must be carefully handled and decompressed. Tool Box StorageComes with 5 adaptors for various spring diameters, as well as to fit valve spring correctly for safe and easy compression. Complete 10 pcs parts are well packed and assorted in a plastic box for convenient storage and carry Parameter Weight:1.4kg Case size:34*19.5*5cm 5* strong metal collets length(50) 5* strong metal collets diameter (16mm, 19mm, 23mm, 25mm, 30mm) Extension screw 1 size:m13.5*120mm Extension screw 2 size:m13.5*120mm Extension screw 3 size:13.5*70mm 1* spring compressor U-clamp with a max jaw opening of 9-1/2 inches