Precise 3-Piece Chuck Stop Set - OMT-520

• Mounts magnetically on the face of any 3 jaw chuck 5" or larger
• Front and back surfaces are parallel within ±.0004" (±0.01mm)
• Allows small and short parts to project past the chuck jaws, and not fall inside the bore
• Anondized alumnium finish
• Includes (1) Each of 15, 20 and 25mm stops