Size:M4-0.7 x 6mm Are you still bothering about the fasteners? These wing bolt would be the best choice for you to solve the problem. Twisting the bolt by hand, you can fasten two parts(structures)together easily. Specification: Product Name: Wing Butterfly Bolt Material: 304 Stainless steel Thread Size:M4 Thread Pitch: 0.7mm Thread Length: 6mm Measurement System:Metric Package Content: 10pcs x Wing Butterfly Bolt Description: 1. Material: 304 Stainless steel 2. Usage: Twist the screw by hand without any other tools, easy to install. 3. Feature: Special wing design, increase the lateral bearing surface and makes it eaiser to fasten, can be used repeatedly. 4. Applications: Machinery and equipment, electronic equipment, communications equipment, hardware lighting, building bridges, furniture decoration which require insulation, frequent dis-assembly and maintenance.