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1.A thumb nuts with a knurled outside surface, this facilitates tightening by hand. 2.The circular nut with knurled is easy to assemble and disassemble. 3.Made of good quality metal material, nickel plated finished, wear-resisting and durable to use. Specification: Material: Metal Finish: Nickel plated Thread Size: M4 x 0.7mm Outter Diameter: 12mm / 0.47" Overall Height: 8mm / 0.31" Thickness( Knurled part): 3.8mm / 0.15" Package content: 20 x Knurled Thumb Nuts
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