The Ridgid 44165 is a centering assembly set. The assembly is used with the Ridgid 300, 300A and 535 threading machine. The set contains all of the materials necessary for assembly. Ridgid products offer unmatched durability and reliability. Ridgid has remained the symbol of certainty to dedicated professionals of the expert trades. Every tool that bears the Ridgid brand is engineered to the same high standards of quality and strength and endurance, as the first heavy-duty pipe wrench more than 80 years ago. Ridgid covers its products with a lifetime warranty against defects in material or workmanship for the life of the tool.