6 inch Kirk & Blum Standard Punch Angle Ring
K & B pressed and rolled steel angle rings are used widely in joining ductwork together in dust and fume control work. All rings are of black steel, unpainted.
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Catalog
https://assets.unilogcorp.com/640/ITEM/DOC/Kirk_Blum_19304_Catalog.pdf
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Catalog
https://assets.unilogcorp.com/640/ITEM/DOC/Kirk_Blum_19304_Catalog.pdf