Eliminates the need to machine soft jawsBenefits Increases productivity saves set-up time. Applications Mounts magnetically on the face of any 3 jaw chuck 5 or larger.Features Front and back surfaces are parallel within 177.002 (1770.05mm).Allows small and short parts to project past the chuck jaws, and not fall inside the bore.Anodized aluminum finish.Notes diamsChuck Not Included.OTMT CS30B 30MM 6 Blue Chuck Stop for 3 Jaw Chucks