Famous CM-13 Mini Ratchet

float: start;

Rated for 200 inch/lbs of torque
Exceeds the torque standards set by military specifications
Unbeatable in tight spaces
Drive in or out by flipping the ratchet over
Non-magnetic
Chapman screwdriver insert bits have knurled ends to use for finger tightening. 
Famous mini ratchet is under 4" long and provides over 200 inch/lbs or torque (equal to 4x the torque of a large screwdriver).