The ED-645L1 is a lever start torque scewdriver with an ergonomic design to ensure operator's comfort. This screwdriver has a Full Auto Shut-Off clutch that completely stops the bit of the screwdriver once the torque setting is reached. This feature ensures that the fastener is not damaged by the screwdriver's bit. Common usages for these scewdrivers are assembly fastening applications that require precision torque control.