[Sizes] Available in 16 sizes: 5mm,5.5mm,6mm,7mm,8mm,9mm,10mm,11mm,12mm,13mm,14mm,15mm,16mm,17mm,18mm,19mm [High Quality] Made of heat-treated chrome Vanadium(CR-V) steel with magnetic, extra high hardness,anti rust and break, durable and long service life [Easy to Use] Strong magnetic nut setter driver, one hand operating, easy to install and avoid falling off. Laser marked size, easy to pick out for beginners [1/4" Hex Shank] Quick change and release, fit corded or cordless power drills, pneumatic screwdriver, electric screwdriver, manual screwdrivers [Wide Applicatio] Great for DIY woodworking, carpentry, machine & auto parts repair, etc, nice gift for handyman, Manufacturer: BE-TOOL