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C-clamp 
Portable tool with a C-shaped frame, used for keeping objects from moving while working on them.
handle
Sliding bar for tightening or loosening the adjusting screw, thereby spreading or closing the jaws.
adjusting screw
Threaded shank whose rotation is controlled by the handle; it moves the jaw toward or away from the piece to be clamped.
frame
Rigid metal support in the shape of a C, having the fixed jaw on one end, while the other end contains a hole for the adjusting screw.
throat
Opening made by the frame.
swivel head
End of the tightening screw; it pivots to adjust to irregularly shaped objects.
movable jaw
Smooth or striated jaw that presses an object against the fixed jaw.
fixed jaw
Smooth or striated part against which the movable jaw presses an object.
