The four different attachments adapt to countless applications and are readily interchangeable, being clamped by a ball swivel-joint, which permits adjustment to an angular position or true concentrically. Working centres and edges can be quickly and accurately located, including confined areas such as slots or shallow holes. With Starrett Last Word Test Indicators, the user can check run-out or concentricity, establish centre distances and check straightness or alignment of flat surfaces. Centre finder with pointed shank, ball contact, disc contact and offset indicator holder in a case.