Excellent Features: Strong vibration resistance, can prevent loosening. The large contact area can withstand strong pulling forces. High Quality: It is made of high quality carob steel, which is durable. Convenient: Easy and convenient to install, quick and easy, there are nine styles to choose from. Uses: Widely used in industry, railway vehicles, shipbuilding, engineering machinery, office machinery , electronic products, engineering plastics, high-tech furniture, aluminum die-casting and other industries. Satisfaction Guarantee: We care about every customer's feeling. If this product does not meet or exceed your expectations, return it for a 100% refund, no questions asked. Step 1: Drill or form a hole, adjust size to recommended diameter after the test. Screw the self-tapping insert into the manual installation tool with the slot or hole down and the tip of the tool not extending beyond the top of the hole or the top edge of the slot Step 2: Screw the nut vertically into the hole. When screwing 1-2 steps at the beginning, it is necessary to check whether there is a gap. If there is a gap, it should be removed and realigned immediately. Be careful not to reverse the installation tool when self-tapping Step 3: When the self-tapping threaded insert reaches the expected depth (the top of the threaded insert sinks 0, 2mm from the work surface), use a hex wrench to tighten the hex nut underneath, turn it counterclockwise, and remove the installation tool. Specification: Condition: 100% Brand Material: Carbon Steel (Color Galvanized) Package Content: 20 Threaded Inserts.