This Set of 268 Pieces comes with a premium durable box. A screw is a type of fastener, in some ways similar to a bolt (see Differentiation between bolt and screw below), typically made of metal, and characterized by a helical ridge, known as a male thread (external thread). Screws are used to fasten materials by digging in and wedging into a material when turned, while the thread cuts grooves in the fastened material that may help pull fastened materials together and prevent pull-out. There are many screws for a variety of materials; those commonly fastened by screws include wood, sheet metal, and plastic. Contents - Screw (Flat Top) 5x65mm - 23 Units; Screw (Round Top) 5x65mm - 25 Units; Screw (Flat Top) 4x40mm - 30 Units; Screw (Round Top) 4x40mm - 35 Units; Screw (Flat Top) 3.5x35mm - 40 Units; Screw (Round Top) 3.5x35mm - 40 Units; Ahchor (plug) 8x51mm - 20 Units; Ahchor (plug) 6x36mm - 25 Units; Ahchor (plug) 5x31mm - 30 Units
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