THIS IS A LYNDEX CAT 30 TOOL HOLDER MANUFACTURED BY LYNDEX. THE HOLDER TYPE IS CAT 30. KEY DIMENSIONS INCLUDE A BORE HOLE DIAMETER OF 16 MM, A BODY DIAMETER OF 27 MM, A PROJECTION OF 2.5 INCHES, AND AN OVERALL LENGTH WITH BUTTON (OAL W/ BUTTON) OF 5.75 INCHES.