These rotating industrial hooks incorporate a double ball bearing design and swivel or rotate freely in either direction. The top hooks are made from 0.236 diameter mild steel, while the bottom hooks are made from 0.188 mild steel, with an overall length of 4-1/2". The hanging capacity of this type of hook is in excess of 200 pounds! You can buy these hooks online in both "V" bottom (Wh-1V) and "U" bottom (WH-1U). Rotators can be manufactured with laser-cut or machined gears to provide smooth indexing where needed. Our engineers can assist you in a design that incorporates proper indexing for your requirements. Contact us to discuss your options.