1.Material: The T-pin steel needle is made of stainless steel, which is strong and durable, with good wear resistance, impact resistance, pressure resistance and abrasion resistance, and can be used for a long time. 2.Sufficient quantity: The package contains 50 pieces of tile installation tools for tile leveling system, which can be replaced if the needle head is broken or deformed; the quantity is sufficient to meet your daily needs and replacement. 3.Size details: Each replacement T-pin steel needle is about 32mm/1.26 inches long and about 1.5mm thick, suitable size for tile gaps between 2 and 6mm, suitable for tiles with thicknesses of 0.12 inches/3mm to 0.63 inches/16mm. 4.Suitable for: The replaceable T-pin needle kit is ideal for floor/wall settings; the system ensures flatness between tiles and avoids movement during mortar setting. 5. Easy to install: The replaceable pin tool is easy to use, just remove the nut cover, insert the T-pin steel needle into the groove, put the red cover into the groove, and tighten the nut cover; remove the T-type straightener about 5-6 hours after leveling, before the tile adhesive or cement is completely dry; this will increase the speed of tile installation and be more cost-effective.