A quick squeeze of the handles and the ratchet mechanism locks the clamp in place. Bear in mind, these are not heavy duty clamps for putting massive amounts of pressure, but a good squeeze will hold parts firmly enough together whilst glue dries or simply hold something in place.
WHAT IT DOES
The clamps feature a box‑joint design, which prevents twisting and keeps the jaws aligned
soft, pivoting jaw pads won't damage delicate work