Usage Tips:Description: Material: Crafted from quality iron, these caltrops spikes are designed for long-lasting durability and strength, ensuring they remain effective in various conditions Effective Bird Deterrent: 1.2/1.4 in spikes keep birds away and protect your space Optimal Size for Versatility: Each caltrop stands at a height of 3/3.5 cm, making them suitable for a wide range of applications, from security to landscaping Sharp and Effective Design: Featuring a sharp design, these Tire Spikes are engineered to provide maximum penetrations and stability when deployed on different surfaces Comprehensive Set: This package includes 20 individual caltrops, offering ample quantity for extensive coverage or multiple uses as needed Specification: Height 3cm/1.18inch Height 3.5 cm/1.38inch Package Includes: 20 Tire Repair Nails Note: Please allow slightly errors due to manual measurement and different monitors.