Metal frame fixing fasteners provide heavy-duty fastening solutions which are used to mount metal frames, and doors on bricks and concrete. These fasteners come with a plug that expands as and when a screw or bolt is tightened, thereby creating a secure hold. They are an excellent choice when it comes to construction and industrial applications, since they can provide high load-bearing capacity along with vibration resistance. Material Grade Mild Steel 4.6 Size Range Diameter M8 to M12 Length 80mm to 200mm