Check the listing for details. Knurled Thumb Nuts, 6Pcs M4 Stainless Steel Knobs Fasteners Blind Hole Silver. Condition: New. Listed at 10.26 USD. Description:[Material] Our knurled thumb nuts are made of 304 stainless steel, high-hardness, durable, wear-resistant, sturdy, not easy to rust or fade, with a round knurled body, which can be used for a long time.[Advantage] Knurled thumb nuts are designed with clean, compact, and accurate thread, which makes it not easy to be out of shape or slide in the process of rolling.[Easy to Use] Our adjusting nuts are designed with a knurled surface and clear slotted head, which can be easily tightened, installed, and removed by hand. No tools are required.[Wide Applications] These round knob fasteners can be widely used in the machinery industry, furniture fastening, 3D printer beds, and other electrical or industrial products.