Energy Conversion Experiment Kit for STEM Education, School Lab Science Projects with Hands-on Learning Tools

Magnetosphere locking screws, tight bite, reduce unnecessary slippage by 85%Easy to use. Simply insert the screwdriver bit into the magnetic ring, the screw can be easily gripped.Plastic magnetic ring suitable for 1/4" shank electric screwdriver bitsUse for Hex, Torx, Slotted, Phillip, improve screw holding work efficiencyMagnetic ring only, other accessories demo in the picture is not included! Note: The data are all manual measurement, please allow error of 1 - 5cm, due to the difference in light and display, there will be a certain color difference, depending on the physical object received.