Abstract: A display device for displaying an adjustable spanner comprises a display panel having at least one ratchet holes for receiving at least one polygonal cylinder; each polygonal cylinder serving for connecting a respective adjustable spanner; a cambered slot formed in the display panel; and a clip for clamping the adjustable spanner to a cambered slot so that the adjustable spanner moves along the ratchet hole with the ratchet hole being as a moving center. A description paper is adhered to the display panel. It is only necessary to move the adjustable spanner reciprocally, the polygonal cylinder can be tightened or released so that the spanner clamping the polygonal cylinder can be tested by buyers before buying the spanner.

Abstract: A pair of pliers mainly includes a first body part having predetermined length, thickness, and shape; a second body part having length, thickness, and shape adapted to work with that of the first body part; and a joint pivotally connecting the first and the second body part together at a predetermined position. The joint is movable within a defined range to enable quick adjustment of jaw opening of the pliers, and is locked in place once it is moved to a desired position.

Abstract: A wrench includes a handle, a first jaw block pivotally connected a head of the handle, a second jaw block movably connected to the first jaw block to define a variable clamp space between them, and a rotating unit mounted on the first jaw block for adjusting an openness of the clamp space. When using the wrench to tighten or loosen a hex bolt to a certain degree, a user needs only to pull the handle in a direction opposite to that in which a force is applied on the handle to tighten or loosen the hex bolt, so that the clamp space on the first jaw block is caused to instantaneously slip and turn relative to the clamped hex bolt, allowing the user to apply a force on the handle again without the need of repeatedly removing and replacing the wrench from and onto the hex bolt.