Comments about Grip-It Grip It Dual Clip Single Arm:
One clamp is about 6 1/2" long and the other is about 4". The clamps are very tight and seem to hold well. The arm is made up of plastic segments and has a decent range of motion. However, the segment holding the small clamp kept popping out while bending, so you have to be careful. It goes back together easy enough - but its a hassle.