Klenk DA86450 Select-A-Bit Ratcheting SPEED Driver with 16 Bits 4 to 1 ratio action makes it the fastest hand-operated driver on the market! Holding the black collar while turning the handle, nosepiece turns 4 times for every 1 of handle. Reversible ratchet changes direction quickly with one hand, even during use The 4:1 ratio works best when driving screws and nuts in low-torque situations Made in USA