Clean construction.1. Tightening process does not damage the attachments, and can be used near the edges or corners of the material. The screw threads are high and low (i.e. high threads) on the ALC with a diamond cut (cutout part) to cut the screws sharp, and the low thread for smooth and perfect tightening. Excellent working and holding power. Can be pushed directly to ALC. (No holes needed) Stainless XM7 SUS304 (18Cr-8Ni) Passive treatment for rust resistance. (Excellent rust resistance) Compared to LC specific nails and anchors, it has excellent pulling strength. (Excellent Retention Strength) Adopts a special shape of high low thread, which does not break the ALC board. (Can be hung) All screws do not open (Contact joint) Can be installed near the backside of the original material. (Excellent Construction) No anchors or plugs are used, and it screws into ALC without any drilling holes, saving your work time. (Excellent Work-Efficiency) Since it produces very little particles out of the package, the inner screw is firmly made, so it has excellent holding power and will not get dirty around the surroundings. (Keep clean) Be careful not to overtighten the ALC plate as it is brittle, so please do not overtighten it with high torque. Or hand tightening)