Threading very fine needles is now easy with the Sewline "Quickthru" needle threader, designed specifically for those very fine needles (size 9 - 12). The case slides open to reveal a clever mechanism. Simply insert the fine needle and lay the thread in the groove. Pressing LIGHTLY on the lever directs a shaped pin into the thread through the needle eye. Simply slide out the threaded needle and there is a cutter underneath the cartridge to cut your thread. The case is compact, easy to carry and it has a compartment to hold extra needles with a magnetic top to help pick up your needles.