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! By holding the black collar while turning the handle, the nosepiece turns 4 times for every 1 turn of the handle. Reversible ratchet changes direction quickly with one hand, even during use. Use 4:1 ratio to drive screws and nuts in low-torque situations. Use 1:1 ratio for higher torque operations. Slotted - 3/16" 1/4" Phillips - 0, 1, 2, 3 Hex - 3/32", 1/8", 5/32", 3/16" Roberts - 2, 3 Star - T15, T20, T25, T30