Premium Materials:This set is made of high quality steel, and this set includes 8 pieces socket convertor adaptor setPremium Materials:This set is made of high quality steel, and this set includes 8 pieces socket convertor adaptor setEasy Recognition:Each socket has its size imprinted on the socket itself, this design can let themselves easy to be identified after you've got them from the caseLong-term Use:This set is manufactured of chrome-molybdenum steel with heat treated for high strength and durabilityHandy Carry Case:There is a plastic case for the easy storage and transportation of all the components, quite convenient for your daily useProfessional Use:This set experienced hardened and tempered processes, so it is a professional tool set for commercial or daily use