DIN7 is a standard for Parallel Dowel Pins that specifies the dimensions and tolerances for cylindrical dowel pins used for accurate alignment of parts in machines and other mechanical applications. These pins are cylindrical in shape, with a smooth surfa
Aluminium wall facade is a kind of important and popular building material in modern architecture culture. Since the rich design style, fireproof and long life using, aluminium facade widely used in curtain wall, outdoor fence, exterior wall cladding and