Quality material: T-pins steel needles are made of stainless steel, which is durable and sturdy, with beautiful abrasion resistance, impact resistance, pressure resistance and wear resistance, can serve you for a long time Sufficient quantity: the package comes with 100 pieces tile installation tools for tile levelling system, and they are replaced in case of a broken or deformed needle, abundant quantity can meet your daily needs and replacement Size Guide: Each replacement T pins steel needle measures approx. 32 mm in length, the thickness is approx. 1.5 mm, the correct size is suitable for tile gap between 2 and 6 mm and suitable for tiles with a thickness of 3 mm to 16 mm SUITABLE FOR: The interchangeable T-pin needle set fits well on floor/wall, the system ensures flatness between tiles and avoids movement during grouting Easy to install: the replaceable pen tool is easy to use, you just need to remove the nut cover, insert the T-pin steel needle into the groove, insert the red cover into the groove and tighten the nut cover; remove the T-type straightener about 5-6 hours after levelling before the tile binder or cement is completely dry, it increases tile installation speed and is more cost-effective