Box of 4
 
The most used connectors. They let you create a right angle between two panels. 
Each connector includes a stainless steel screw that allows it to be used outdoors, with all types of boards with a uniform thickness between 16 and 19 mm (0.63 '~ 0.75' inches). These dimensions range complies with the most common panels available on the market.
 
T-junctions
The 90° connectors used in pairs can create a T-junction to fix three panels and obtain a shelf. This type of fastening allows you to create complex and dynamic shapes that can be used for shelves and bookcases. The 90° connector is extremely resistant and a 40 cm width cube, supports up to 200 kg.