The Velbon Angle Adapter 4 provides a right angle mount for a tripod head or camera on a horizontal arm such as the Velbon V4. The base mount is either 1/4" or 3/8" (two inserts are supplied), and the top platform is 1/4". This can be adapted to 3/8" by means of an inexpensive adapter. Once mounted, the Adapter can be rotated 360° and locked in any position. Base diameter is 40mm.