Valve spring compressor tool for all 3/8in 7/16in rocker studs1、OE Number: The part number for reference is 66784. Please confirm whether it is consistent with the OE you need to avoid wrong buying and other problems. 2、Multifunctional Use: The valve spring compressor tool is suitable for all 3/8in and 7/16in rocker studs, specially designed for compressing valve springs with the cylinder head on block, can easily and quickly remove valve spring from an assembled engine for checking or replacing. 3、Heavy Duty Steel Construction: The engine valve spring removal tool is crafted from heavy duty steel for enhanced reliability and durability, resistant to oxidation and wear, ensuring long lasting performance. 4、360 Degree Swivel Handle: The handle swivels 360 degrees to compress and lock spring down to desired height, making it easy to remove or install keepers, press down to compress coil spring and remove valve keepers. 5、Enhanced Grip: The valve spring compressor install and remove tool features a enhanced grip handle for anti slip and effort saving use, providing a secure grip during use for enhanced safety and comfort.