FUTONG Specialized in ODM for Metal Timber Connectors,Client send one sample's picture to FUTONG,Mark shape dimension and tell us the thinkness of material is 1mm,Client said some them new idea or innovation,customer hope add some knuckle nails or tylok nail,our design engneer make the drawing of joist hanger with tylok nail,we change and update the screw holes for adapt more screw or nail.