Angle Brackets. Bosch Rexroth angle brackets can be used to make a strong connection between 20 x 20, 30 x 30, 40 x 40, 45 x 45 or 50 x 50 profiles at an angle of 90°. Features ; Benefits. Brackets are unpainted Includes non-turning centring lugs for rapid and precise alignment. Product Application Information. Used for shelf supports, structure reinforcement, securing systems to the floor and so on.