Aluminum alloy material: The magnetic ring of the screwdriver is made of aluminum alloy and strong and durable magnetic.Magnetic ring: The magnetic ring can firmly hold the screw to prevent the bit from slipping, thus extending the service life of the bit. Practical tool: it is more convenient to mount the grooved screwdriver bit, suction screw, fixing screw and the mounting screw. two colors: the ring magnet comes in two colors to choose from: red and yellowExcellent workmanship: the ring magnet has excellent workmanship, easy to use and easy to install Size15MM*21MM >Note: The data are all manual measurement, please allow 1-81cm error, due to the light and display difference, there will be some color difference, depending on the physical object received.