WOODPECKER C-760A 16 Guage Pneumatic Hog Ring Gun, 3.0mm to 4.0mm Closing Diameter,
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WOODPECKER C-760FRT 16 Gauge 1/2-Inch Air Hog Ring Gun with Variable Speed Control, 3.0 mm to 4.8 mm Closure Diameter, Pneumatic Hog Ring Plier Tool for Fencing, Cages, Fastening - Amazon.com