Reed's L16-1 is a Heavy-Duty Square Drive Ratchet Wrench. It has a 1" female drive capacity. It weighs 4.4 lbs. This square drive wrench is great for ratcheting line-up clamps, welding steel pipe, and for other process piping needs. Certain valves require square drive ratchet wrenches, and the ratchet and reverse option speeds up the job.