EM-Tec HS17 Hitachi swivel stub mount. The head of the mount is attached to the cylinder stub via a swivel hinge which allows for 90 degrees tilting each way. Can be rotated 360 degrees in the cylinder stub. Excellent mount for SEMs without tilting facilities or when random tilt angled are needed. When the desired tilt angle is set, the top is secured with a socket cap screw. Top diameter is 15mm and the total height is 30mm.