90 degree corners are used when creating a corner signbox which can be mounted to a right-angle substrate. It allows you to tension each corner adding additional support. Brackets are used to connect and support 2-slot/4-slot frame to KlickRail frame and adds additional support and strength. The tensioning grips are used to manually tension the KlickRail klicks. The internal corner is used to connect to 2 lengths of KlickRail at a right angle. The KlickRail klicks are used to lock flex-face material into the KlickRail frame and helps create the correct amount of tension. Nylon strips are used in conjunction with klicks for tensioning flex-face material and prevents the material from slipping out of the frame. The M8 nuts and bolts are used for fixing KlickRail brackets to 2 and 4-slot frames. The tensioning gun is used to mechanically tension the KlickRail klicks.