The SBH-100DQ BK compact ball head is ultra-light.  A single lever locks and releases the ball allowing for a full range of movement.  As a result, you can lock the camera in position at almost any angle.  The all-metal ball head has a small, low profile quick release plate.
 
Base diameter: 37mm
Size of camera platform: 40 x 30mm
Camera Platform: Q.R.S. 6252
Camera mounting screw: U1/4
Tripod mounting screw: U1/4
Height: 68mm
Weight: 130g
Load capacity:2kgs