Abstract: A hex wrench includes a handle with a first twist portion having a substantially helical profile through an entire length thereof, a head with a second twist portion having a substantially helical profile through an entire length thereof, and a curved transition portion connected between the handle and the head. A first mounting portion which is a regular hexagonal prism and non-twisted extends integrally from the handle, and a second mounting portion which is a regular hexagonal prism and non-twisted extends integrally from the head. As such, the hex wrench has greater strength and stiffness without reducing its malleability so as to prevent the hex wrench from being cracked or broken due to an excessive applying force.

Abstract: A star-type wrench includes a shank, a first operation portion mounted on a first end of the shank, and a second operation portion mounted on a second end of the shank. The shank is formed integrally to have a star-shaped outer diameter. Thus, the shank has a star-shaped outer diameter so that when the first operation portion or the second operation portion is broken, the first operation portion or the second operation portion can be removed from the shank, and the shank can function as an auxiliary operation portion and can be reused and operated successively.

Abstract: A hex wrench includes a handle with a first twist portion having a substantially helical profile through an entire length thereof, a head with a second twist portion having a substantially helical profile through an entire length thereof, and a curved transition portion connected between the handle and the head. A first mounting portion which is a regular hexagonal prism and non-twisted extends integrally from the handle, and a second mounting portion which is a regular hexagonal prism and non-twisted extends integrally from the head. As such, the hex wrench has greater strength and stiffness without reducing its malleability so as to prevent the hex wrench from being cracked or broken due to an excessive applying force.

Abstract: A puller includes a main body provided with a plurality of support seats, a plurality of clamping members each pivotally and detachably mounted on a respective one of the support seats, a top cover mounted on the main body and provided with a plurality of pressing pieces each pressing a respective one of the clamping members, and a threaded rod extending through the top cover and the main body. Thus, each of the clamping members is pivotable relative to the respective support seat of the main body so as to adjust the inclined angle of each of the clamping members relative to the respective support seat. In addition, each of the clamping members is locked onto and unlocked from the respective support seat easily and quickly.

Abstract: A hex wrench includes a handle (21) and a head (22) connected with the handle. The handle has a surface provided with a first twist portion (212) which has an axis that is not parallel with the axis of the handle, and the head has a surface provided with a second twist portion (222) which has an axis that is not parallel with the axis of the head. Preferably, each of the first twist portion and the second twist portion has a helical profile to conform to the torsional shear stress applied by the hex hole screw during operation of the hex wrench so that the hex wrench has greater strength and stiffness without reducing its malleability so as to prevent the hex wrench from being cracked or broken due to an excessive applying force.

Abstract: A puller includes a main body provided with a plurality of support seats, a plurality of clamping members each pivotally and detachably mounted on a respective one of the support seats, a top cover mounted on the main body and provided with a plurality of pressing pieces each pressing a respective one of the clamping members, and a threaded rod extending through the top cover and the main body. Thus, each of the clamping members is pivotable relative to the respective support seat of the main body so as to adjust the inclined angle of each of the clamping members relative to the respective support seat. In addition, each of the clamping members is locked onto and unlocked from the respective support seat easily and quickly.