These work stand are designed for use with most popular cylinder heads. Rotates 360 degrees for easy access to all sides. Helps simplify the job of cylinder head porting and polishing. Makes valve and spring installation much easier and with 2 outer stands to support the head you can work safely.  Made from abs plastic, but very strong as you can see from the 2 iron big block heads mounted to it. Includes 2 adjustable safety supports for under the head. Stands bolt to existing accessory holes.