Abstract: A measuring device is adapted for determining a safety thread length LS of a fastener required for fastening a wheel onto a wheel hub unit. The measuring device includes an elongated measuring rod, a positioning member secured to a front end of the measuring rod and configured to abut against a circumferential abutment seat of the wheel, and a plurality of modular sleeves, each configured to be sleevably positioned on and matched up with the measuring rod. Subsequent to bringing the positioning member to abut against the circumferential abutment seat, the modular sleeve is dragged forwardly until a front sleeve end reaches an inner major surface of the wheel, and LS is determined to be equal to the distance between the front end and a rear sleeve end of the modular sleeve.

Abstract: A fastening device is adapted for securing a wheel rim to a vehicle axle and is adapted to be driven rotatably by a driving tool. The fastening device includes a fastening member and a protection cap. The fastening member has a tool-engaging head portion and a first positioning portion. The protection cap has a cover portion and a sleeve portion that cooperates with the cover portion to cover the tool-engaging head portion and that is formed with a second positioning portion engaging removably the first positioning portion. When the protection cap is removed from the fastening member, the tool-engaging head portion of the fastening member is engageable with the driving tool.

Abstract: A fastener for securing a wheel rim to an automobile axle unit includes a shank segment, a hollow head segment and a securing pin. The shank segment has first and second threaded end portions and a smooth stop portion interconnecting the first and second threaded end portions. The head segment is formed with an internal thread engaged with the first threaded end portion, and has an abutting portion adapted to abut against the wheel rim and having a cross-section converging toward an open end thereof. The securing pin extends through the head segment into the shank segment for securing the head segment to the shank segment.

Abstract: A sectional adjustable socket tool handle, which controls the movement of an axial rod along the axial direction of an external pipe. The tool includes a plurality of grooves, a coupler for engaging the plurality of grooves, such that a latch member on the external pipe is latched into the groove under normal conditions, and the coupler can move between a first position and a second position along the axial direction of the external pipe. When the coupler moves to the first position, the coupler will press against the latch member to prevent the axial rod from moving. When the coupler moves to the second position, the coupler will release the latch member.