Air duct Flange: 40 40 4. Angle Steel: 50 50 5.
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eBay
Rechargeable Hydraulic Riveting Machine Automatic Portable Air duct Flange Angle iron/Iron sheet Punching Rivet pliers Air duct Flange: 40*40*4 Angle Steel: 50*50*5 Rivet Size: 4*10/5*10
eBay
Precise buckle without power operation silent.
eBay