Set includes a wiggler chuck to hold ball contact, disc contact & needle point attachments and an offset indicator holder. Very useful item for locating application points on milling & other machines.Use to check run-out or concentricity, establish centres, check straightness or alignment of flat surfaces. Includes: chuck holder, needle point, 0.25" dia ball, 0.1" dia disc and offset indicator holder. Comes in a beautiful Pauch packaging.