Gently and precisely braces and supports door casing during foam filling of wall joint Telescopic square anodised aluminium tubing with mm scale and adjusting screw for precision work Cross-shaped pressure plate with interchangeable clamping elements for frame depths of 6 to 13 cm or 13 to 30 cm Removable clamping bracket with increased clamping surfaces and removable brackets to insert the door frame securely and easily