An extruded corner bracket is provided, the corner bracket comprising a length; a body extending the length; a pair of wings extending the length and extending outward from the body to define, with the body, an outer right angle and a pair of inner right angles, the inner right angles being normal to each other, each inner right angle having a first face and a second face; and a slot within the body and extending the length, the slot for slidably, non-rotatably retaining a nut and for housing a distal end of a bolt, the slot including an elongate opening defined by a distal edge of each first face. A corner bracket assembly, rectangular structures using the corner bracket assembly and a kit are also provided.

A position adjustable support assembly provides a support extension that is detachably attachable to a support member. The support extension is attached by an extension attachment that has a support coupler that extends along the length of the support member and has a gap opening to allow the support coupler to be snapped onto the support member. The support coupler may be cylindrical in shape and snap over the rod-shaped support member in a concentric coupling arrangement. The support member has a fin slot for retaining a plurality of fins that extend up from the outside surface of the support member. The fins are slid into a retaining slot along the inside surface of the support coupler to retain the support coupler and support extension in a rotational position with respect to the support member. The support extension can be slid along the length of the support member.

A position adjustable support assembly provides a support extension that is detachably attachable to a support member. The support extension is attached by an extension attachment that has a support coupler that extends along the length of the support member and has a gap opening to allow the support coupler to be snapped onto the support member. The support coupler may be cylindrical in shape and snap over the rod-shaped support member in a concentric coupling arrangement. The support member has a fin slot for retaining a plurality of fins that extend up from the outside surface of the support member. The fins are slid into a retaining slot along the inside surface of the support coupler to retain the support coupler and support extension in a rotational position with respect to the support member. The support extension can be slid along the length of the support member.

Wall-mountable storage systems suitable for holding bulky and/or heavy construction materials such as boards or panels, or the like, are disclosed. Storage structures can include two substantially similar open frame panels attached to each other by spacer bars to define an internal storage space therebetween. Each panel may include two major outer rails and two minor outer rails, with major inner rails disposed between the major outer rails and with minor inner rails disposed between the minor outer rails. The inner rails may have a first center-to-center spacing and each outer rail may have a second center-to-center spacing with its nearest neighbor inner rail, the second spacing being greater than the first spacing. The first spacing may substantially equal a standardized spacing for wall studs. The outer rails may each have a width greater than a width of the inner rails. The storage structure may form a rectangular cuboid.

A modular and reconfigurable stand is provided. The stand has legs that support bolt plates and the bolt plates are bolted to brace assemblies. The brace assemblies support shelves. The brace includes structurally identical cross damping support arms. The brace assembly also includes structurally identical first and second brace mounts. Each of the cross damping support arms is connected to each of the first and second brace mounts, and the brace mounts are connected to two legs. Double damper brace assemblies are also provided. In another embodiment a modular performance stand is provided having cross damping support arms that are connected to first and second modular shelf mounts having channels. The channels support four or more isolator elements. The modularity of the cross damping support arms and modular shelf mounts allows the width and depth of the modular performance stand to be varied to optimize performance.

A modular and reconfigurable stand is provided. The stand has legs that support bolt plates and the bolt plates are bolted to brace assemblies. The brace assemblies support shelves. The brace includes structurally identical cross damping support arms. The brace assembly also includes structurally identical first and second brace mounts. Each of the cross damping support arms is connected to each of the first and second brace mounts, and the brace mounts are connected to two legs. Double damper brace assemblies are also provided. In another embodiment a modular performance stand is provided having cross damping support arms that are connected to first and second modular shelf mounts having channels. The channels support four or more isolator elements. The modularity of the cross damping support arms and modular shelf mounts allows the width and depth of the modular performance stand to be varied to optimize performance.