A tool box contains: a body, a fixing mount, a casing, a hanging seat, and a plurality of screwdrivers. The body includes two connecting notches and two limiting recesses formed on two sides of an inner wall thereof. The fixing mount includes two ends accommodated in the two limiting recesses and moving upwardly and downwardly in the two limiting recesses, and the fixing mount also includes a plurality of receiving holes and two resilient elements fitted on a bottom end thereof. The casing fits with the body and includes two cutouts, and the hanging seat includes two connection protrusions to connect with the two connecting notches of the body and the two cutouts of the casing. Each of the plurality of screwdrivers includes an extension fitted into each of the plurality of receiving holes of the fixing mount.

A replacement lead case includes a case body that forms an inner space surrounded by a rear surface plate and right and left leg plates as a replacement lead accommodation room and has a lid body on the tip end thereof and a case part on a rear part thereof via a bendable thin part provided on the rear surface plate, and a cover member that has a U-shaped cross-section orthogonal to a longitudinal direction molded by a front surface plate and right and left outer leg plates covers the replacement lead accommodation room on a case body with the front surface plate and slidably supports the case body in the longitudinal direction with the leg plates positioned on the inside of the outer leg plates. A rail-shaped guide is formed on the lid body along the longitudinal direction, and the cover member includes a slider that contacts the guide.

Various socket storage systems are shown. The socket storage system includes one or more storage rails, socket holders of various sizes and socket posts. The socket storage rail includes a plurality of dovetail attachments allowing for selectively coupling between socket storage rails. The socket holders are adjustable relative to the socket storage rail for additional customization.

A packaging device for coaxially aligning and retaining an elongated machining tool, comprising a plug and a cap configured to fit together, defining an inner space for accommodating the tool. The plug includes a cylindrical wall member with threading protrusions, an exterior wall segment with a noncircular contour, and a rotatable cork member with counterpart threading protrusions. In some embodiments, the device may feature tapering end-walls. Additionally, or alternatively, the rotatable cork member may comprise a tamper-evident band. The device may feature a rotation-preventive wall segment for non-rotatable engagement with the tamper-evident band.

The inventive subject matter is directed to socket holders that feature through holes in their bases to facilitate stringing multiple socket holders together. Individual socket holders feature a base portion and a cylindrical portion extending therefrom. The base portion can include one or more concave surfaces that improve user grip, while also featuring a through hole that a flexible member such as a string made from any appropriate material can pass through. An entire set of sockets can be held together by coupling each socket to a socket holder and then stringing the socket holders all together using a flexible member. This reduces the amount of storage space required, makes it more difficult to lose a socket holder, improve portability by making it possible for a user to sling their socket set over a shoulder using the flexible member, and so on.