- What it is and what's included 4 x brass butterfly wing nuts for M10 bolts - Specifications Thread Size: M10 Thread Pitch: 1.5 mm Head Diameter: 15 mm - Material Made of brass; provides corrosion resistance, rust resistance, and good wear resistance for durable fastening - Key benefits Tool-free tightening and loosening by hand with two wide wings for a firm grip Reusable and easy to install or remove Can be used with or without washers - Applications Widely suitable for installation, maintenance and fastening in areas such as furniture, car batteries, roller shutters, bed frames, folding chairs, quick clamps, drums, 3D projects, boat accessories, wheels, mechanical assemblies, electronic equipment, communication equipment, and craft products - How it helps Internal thread allows screwing onto a bolt to join two or more items securely No tools required for assembly or disassembly Wing design provides leverage for quick tightening or loosening by hand - Use scenarios Quick furniture assembly or reconfiguration without tools Easy access maintenance on car batteries or boat fittings DIY projects or modular assemblies where frequent disassembly is needed