... bars can be assembled easily with corner plate and screws.2. flexibility: There is one hole for each ... advantage and convenience is it can be connected with screws, and without welding. equal angle bar sizes: 1 ... 1.5"(free accessories: 2pcs corner plates, 6sets M6x12 screws)unequal angle bar sizes: 2" x 1.5", ... 2.5" x 1.5"(free accessories: 6sets M8x16 screws) thickness: 1.5mm, 1.7mm, 1.8mm, 2. ...