It contains five types of tong blanks that are essential in almost every shop. Machined from 5/16″ thick mild steel, making the tongs lighter and easier to handle when working with smaller stock sizes. Each pair of tongs comes with a rivet. (If you have any questions about installation, please feel free to contact us.) You need to drill or punch. Heat and hit them to get it right. But it’s not difficult. If you’re not 100% satisfied with our item, simply return it for a full refund in 30 days, no questions asked money back guarantee with 18 months’ warranty.