Also known as through wall screw or full thread screw, it is rolled with coarse thread throughout the body and passes through the inner side of the formwork to resist the lateral pressure of newly poured concrete. It is equipped with mountain shaped clamps and nuts at both ends to fasten the formwork, and PVC sleeves can be added at both ends for recycling and reuse. Suitable for reinforcing shear walls, columns, and beams without waterproof requirements, it is the most commonly used screw in the formwork support system of building construction projects. The allowable tensile force for M12 is about 10kN, M14 is about 15kN, and M16 is about 20-24kN.