Material: cup hook made of carbon steel, the surface is coated, not easy to rust. Size: screw hooks length approx 1 inch x width approx 0.48 inch, please carefully check the size before buying. Easy to install: The metal cup hooks have a pointed top that you can easily screw into wood, walls, ceilings. Indoor and outdoor use: screw cup hooks to hang key rings and other small charms, wind chimes and small lanterns, Christmas lights, etc. Efficiency Guarantee: Our XYSMZM products are shipped fast by Amazon, please contact us promptly if you have any questions and we will give you a satisfactory answer at the first time. Note: Please carefully check size before purchase. Please allow slight size error due to manual measurement.