Compared to other 10KN metal fittings, it is good that the number of screws is small, but it seems that screws are difficult to enter unless you use professional impact screwdriver. (With the 12V impact driver for DIY, I took it for a while, I managed to put it in) because this is because there is no notch in the tip of the screw, but when I do construction with an impact driver for DIY, be careful with this point I have to do it. Those that had this notch with metal fittings for 10KN from other companies were OK for DIY. Since there are many metal fittings with this incision, we want manufacturers to describe that there is no such cut in the item description. From now on I would like people other than professionals to use their attention.