1. C Clamp Jaw: Constructed from durable 1.7mm thick heattreated steel with black oxide coating, resistant to bending and deformation during compression. The two ends of the C clamp are precisely aligned in a straight line to prevent slipping during operation. 2. Toolbox Storage: Includes 5 adapters designed for various spring diameters, ensuring secure and effortless compression. The 10piece set is neatly organized in a box for convenient storage and transport. 3. Easy to Use: Tighten the coil spring compressor until it contacts the center bar, then insert it into the coil spring. Compress the spring for removal or installation, releasing only after the spring is properly positioned. Note: Compressed springs store significant energy—handle with caution and decompress carefully. 4. Function: Equipped with 5 adapters of varying sizes to accommodate different spring diameters on most cylinder heads, enabling proper spring mounting and smooth compression.