DescriptionIt is mainly made up of a high grade neodymium magnet and a steel shell. The steel shell is crucial to amplification of magnetic force. It can concentrate the powerful magnetic field on the bottom of the magnet which increases the magnetic force by 2.5-4 times compared to the naked magnet. At the same time, the steel cup can prevent the naked magnet from scratch and chipping during grabbing and clamping.Feature- Color: Silver. - Material: Neodymium magnet. - Size: 3.80X3.80X4.40cm/1.49X1.49X1.73 inch. - It is mainly used for tool droppers and treasure hunters or lifting, hanging, or anywhere you need an incredibly strong magnet. - Designed for heavy duty and underwater use, it can recover lost equipment, tools, ancient ferrous objects and others in deep water, wells, holes, also great for lifting, hanging applications.- Neodymium magnets keep their strong magnetic properties for decades under conditions. - for all magnet fishing, lifting, hanging, and retrieving applications! - The best coating available, which provides a shiny and rust resistant coated steel cup, provides protection for the magnet and helps to prevent chipping or cracking.