smooth metal or plastic without glitch or sharp edges
outer diameter is 22mm and the width is 7mm
High tension resistance
It has a shatter-proof function and enhances the anti-explosion ability of glass
The positioning bit in the center helps for cutting accurate holes
Brass Knurled Thumb Nuts, M4x0.7mm Round Stepped Knobs Fasteners for 3D Printer, Electronic Equipment 24Pcs 80 Grits smooth metal or plastic withoutDescription: 1. Made of brass, this thumb nut knob is good for needs requiring high appearance, has corrosion resistance, rust resistance, good wear resistance, well fastening function and long lasting service than other material. 2. Applied in home appliances, communications industry, automotive industry, etc. Widely used in the installation, maintenance, and fixing of various daily needs: such as 3D printer beds, mechanical assemblies, machine