The invention is a hand tool with an operating head, which comprises: a main body having two parallel ears spaced apart at a front end; and a working head having a body; a column connected to one side of the body; another side of the body is provided with a pivotal block and two flaps to pivotally connect the two ears of the main body between the pivotal block and the two flaps respectively. The two flaps are capable of assisting in supporting outer sides of the two ears to relatively strengthen a structure of the ear, thereby enhancing a torsion exerted by the column on a workpiece, and enhancing durability and strength of the column.

An oil filter tool used to remove filters and mitigate spillage of oil during and after removal. Sidewalls with grooves between form a substantial cylinder. Curved walls form the grooves, extend outwardly from the sidewalls, and provide some flexibility in the tool's diameter, thereby permitting use with filters other than those for which the tool was designed. A floor is joined by the sidewalls and curved walls to define a chamber in which the filter is mounted. A finger limits insertion of the filter to define a gap into which oil can flow. A funneling guide is angled at the end of the sidewalls opposite the floor to guide oil into the chamber. At least one of the grooves is closed at the guide end and there is an aperture to permit air flow out of the chamber.

A tool adapted for use with a diffuser cartridge and a fluid container, wherein the tool is adapted to facilitate insertion and removal of the diffuser cartridge to and from the fluid container. The diffuser cartridge contains mineral agent beads or other materials which can enhance the quality of fluid contained within the container.

A screwing/unscrewing tool for screwing/unscrewing a screw or a bolt includes a first part including a lever secured to a screwing/unscrewing bit provided with at least one screwing/unscrewing recess centered on a main axis, a second part including a support arm equipped with a tapped hole and on which the screwing/unscrewing bit is rotatably mounted around the main axis, and an adjustment screw screwed into the tapped hole and having a coupling head configured for a coupling with a screw-gun or a wrench, and extended by a threaded rod having a free end suitable for abutment on the lever in order to apply a pivoting force to it. The screwing/unscrewing tool may be used with a screw or bolt that is difficult to access in a crane mast or crane jib.

An adjustable locking fastener comprising a post and a lever for use in an aquarium. The adjustable locking fastener includes a post, a lever and a letoff portion. The adjustable locking fastener may be quickly removed and reattached with minimal effort, and with a constant set point for the attachment.

An adjustable locking fastener comprising a post and a lever for use in an aquarium. The adjustable locking fastener includes a post, a lever and a letoff portion. The adjustable locking fastener may be quickly removed and reattached with minimal effort, and with a constant set point for the attachment.

A two-way nut spanner has a handle and an engaging head having a base, a first engaging portion and a second engaging portion. The base has a first abutting surface and a second abutting surface respectively located on two opposite sides of the base. The first engaging portion protrudes from the first abutting surface of the base and has multiple first engaging blocks. Each of the engaging blocks has a first inclined surface. The second engaging portion protrudes from the second abutting surface of the base and has a second engaging block having a second inclined surface. The engaging head has the first engaging portion and the second engaging portion with different engaging structures to enhance convenience for using the two-way nut spanner.

A tool includes a first output from a gear system, the first output along a first axis and a second output from the gear system, the second output along a second axis. A first torque limiter is attached to the first output along the first axis and a second torque limiter is attached to the second output along the second axis. A first tool bit is attached to the first torque limiter along the first axis and a second tool bit attached to the second torque limiter along the second axis.

A tool for torquing a regulator onto a cylinder of a portable cylinder assembly. The tool includes a nut and a socket. The nut is configured to fit around a body of a regulator of a portable cylinder assembly. As such, the nut has a first set of grooves that avoids one or more valve assemblies on the body of the regulator. The socket has a cavity extending therethrough such that the cavity consists of three sections: a top section, a middle section and a bottom section. The top section of the socket is configured to be coupled to a device that applies a torque force on the socket. The middle section of the socket is configured to avoid a case of the regulator which is disposed above the body of the regulator. The bottom section of the socket is configured to be coupled to the nut.

A tool for torquing a regulator onto a cylinder of a portable cylinder assembly. The tool includes a nut and a socket. The nut is configured to fit around a body of a regulator of a portable cylinder assembly. As such, the nut has a first set of grooves that avoids one or more valve assemblies on the body of the regulator. The socket has a cavity extending therethrough such that the cavity consists of three sections: a top section, a middle section and a bottom section. The top section of the socket is configured to be coupled to a device that applies a torque force on the socket. The middle section of the socket is configured to avoid a case of the regulator which is disposed above the body of the regulator. The bottom section of the socket is configured to be coupled to the nut.