The product is a Pre-set Nut with Nickel Plated Steel. This nut can only be put into T slot from profile end, with low assembly efficiency. These nuts are know especially for their good connection and stability. Its shape is very similar to the t slot of a profile, and almost matches it exactly. Therefore, it slides into the t slot from the end of the profile, and since it matches the shape of the t slot, it fits very tightly, making an excellent connection.