This Milwaukee Brand is as good if not better Morlin Model 5400 or Trumpf Model Seam closer seamer Locking Hammer Sheet Metal Tools. This Great working Seaming Tool works and sounds great. Its actually fairly quiet compared to other models we've seen. It has a great shape 8 foot power cord.

Thios Milwaukee Lock Hammer speeds up and takes the work out of the only tedious, costly, and time-consuming job of fabricating duct work- closing the "seam." This tool breezes along at speeds of 15 feet per minute on commonly used gauges. Actually, it can save half of a man's time in making ducts, and do a better job.
Ends Hand Hammering . . .
Just a couple of taps at the center and ends of a standard length duct to secure the lock . . . then this Lock Hammer do all the work
Versatile . . .
Handles 30 to 22 gauge (no adjustment required). For straight runs, inside or outside radius . . . use it in the shop or on the job.
Powerful . . .
HEAVY-DUTY BUILT 115V AC motor . . . more than enough power for any job.
Rugged . . .
Sturdily built for heavy-duty use . . . ball and roller bearings throughout.
Perfect Balance . . .
Weight rests on the work . . . position of handle affords positive control and balance . . . guides easily along the seam.