A non-metallic clip connection system includes a non-metallic clip having a substantially rectangular base portion, a first longitudinal flared wing portion, and a second longitudinal flared wing portion, wherein a plurality of edges of the clip along a path of insertion are beveled or radiused. The non-metallic clip connection system also includes a first non-metallic member having a first portion of a non-metallic clip receiver and a second non-metallic member having a second portion of the non-metallic clip receiver. The first non-metallic member is secured to the second non-metallic member by inserting the non-metallic clip in the non-metallic clip receiver. A non-metallic vertebrae bend restrictor and a non-metallic vertebrae end piece may use a non-metallic clip connection system.

A joining element for coupling two parts of a housing includes a first pair of resilient engagement elements for receiving a first part of the housing and a second pair of resilient engagement elements for receiving a second part of the housing to be coupled to the first part. The first pair of resilient engagement elements is configured to receive and engage with the first part of the housing by a first engagement force. The second pair of resilient engagement elements is configured to receive and engage with the second part of the housing by a second engagement force. Securing the second part by the second pair of resilient engagement elements causes an increase in the first engagement force on the first part.

Methods, systems, brackets, and/or the like are provided. In some embodiments, a multi-connection bracket (MCB) includes a bracket configured to connect a first rail section and a second rail section, wherein the bracket has one or more bracket recesses configured to receive one or more fasteners; and a grounding pad having a pad recess and a plurality of teeth, wherein the pad recess is aligned with at least one of the one or more bracket recesses, wherein the grounding pad is configured to receive the one or more fasteners such that the grounding pad is operably attached to the first rail section or the section rail section, and wherein the grounding pad is configured to deform when operably attached to the first rail section or the second rail section such that the plurality of teeth remove a coating of the first rail section or the second rail section.

A coating cover with a metal structure for roofs of buildings comprises a plurality of slabs of substantially quadrilateral shape, each of which is provided with lateral edges that are parallel and opposite to one another for mutual connection between adjacent slabs in a longitudinal direction and for formation of a joint positioned between each of the adjacent slabs. The lateral edges comprise a first set of folds at least partially symmetrical on the two edges. The lateral edges also include a second set of folds on at least one of the lateral edges, and a third set of folds on at least one other lateral edge. The lateral edges comprise at least one curvature at one of the first set of folds placed horizontal and parallel to the installation base. The cover also has at least one fixing bracket that is configured to join the lateral edges.