The Ridgid 34577 1/4" - 4" replacement reamer blade is used with 744 blade type reamers. It is also an accessory for Ridgid Model 1224 Threading Machines. The solid construction offers 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.