PT 44090 Chuck Jaw Set D838x fits 300 Pipe Threading Machine Steel Dragon Tools Chuck Jaw Set 44090 with Jaw Inserts 44715 For use with RIDGID 300 Pipe Threading Machines. For use with Steel Dragon Tools 300 Pipe Threading Machines. Three (3) chuck jaws 44090 and three (3) chuck jaws insert teeth 44715. Three (3) springs.