This clamp is designed for clamping concrete Lego blocks and concrete kerbstones. An automatic system is used for clamping. The clamp opening is adjustable from 400mm to 1000mm. Because of this, the clamp can be used for various Lego block widths. The clamp is equipped with a height control system with 4 supports. This allows a choice of clamping 1 or 2 layers of kerbstones.