Suitable for tile gap between 2mm to 6mm and tile thickness between 3mm to 18mm. Made from semi-crystalline thermoplastic with high impact resistance. The steel part is made from stainless steel with a thickness of 1.5 mm. Save money by using them again and again. After the tiles are set, simply twist the screws anticlockwise and remove the main anchor. You may need to hammer it gently. Package Includes: 50 Pcs of T Needle, 50 Pcs of Caps and 1 Wrench.