Abstract: A frame element of an installation facility is fastened to a mounting plate of an electrical installation by a fastening element having at least two holding elements, arranged adjacent to one another in a shared plane, that can be elastically deformed relative to one another and each including at least one limb. The limbs are embodied such that they face one another along an imaginary straight line within the shared plane and include a segment of minimal spacing along the imaginary straight line. The spacings of the limbs from one another increase in all other segments along the imaginary line from the segment of minimal spacing.

Abstract: An injection mold (100) comprises a first female mold (10), a second female mold (20), a first male mold (30) and a second male mold (40). The first male mold (30) and the second male mold (40) rotate to align with the first female mold (10) and the second female mold (20) selectively. One of the female molds defines a cutting portion. The injection mold (100) carries on the cutting process on a soft layer of a semi-finished product. The injection mold (100) can eliminate cutting process by using punching and cutting fixture on the soft layer and save lots of time on making the product, improve processing efficiency.