The Manfrotto Super Clamp is made of lightweight cast alloy. Clamps on tubes: 1/2" to 2-1/8". It is a versatile tool which will adhere to flat surfaces, poles, etc. Incredibly strong.
Separately locked movements on three axes make the Manfrotto 056 3-D Head perfect for 35mm cameras, and the conical self-adjusting bearing surfaces on the tilt pivots provide more than enough strength to support medium format cameras. Thumb screw movement locks won't poke you in the eye like conventional handles sometimes do.