Features and Benefits: Use with 3" or longer impact extension; Manufactured from chrome-moly steel; Heat treated for additional strength and durability; 6-point hex, two sizes in each flip socket; For use with 1/2" drive tools; This excellent tire tool measures 19mm x 21mm. Use with 3" in. or longer impact extension. 6-point hex, two sizes in each flip socket. Manufactured with heat-treated chrome-moly steel.