1. Detect water depth to locate the hook bottom 2. Precision craftsmanship with smooth, rounded edges. No burrs on surface / not scratch hook paint 3. Strong magnet design ensures powerful adhesion and prevents loss 4. Triple electroplating enhances protection. Corrosion-resistant, rustproof, and maintains magnetic strength 5. Grooved anti-slip design prevents hook disengagement 6. Waterproof and rustproof construction for all-water-body use 7. Thickness: about 2.5mm
