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Hubbell-Raco 697 Masonry Box, 3 Gang, 3-1/2" Depth, 1/2" and 3/4" Concentric Knockout (Pack of 10): Amazon.com: Industrial & Scientific
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PI363 - DiversiTech PI363 - 4" L x 4" W x 2-1/8" D Galvanized Steel Utility Box w/ 3/4" and 1/2" Knockouts
Galvanised Steel Metal Knockout Adaptable Hobby Project Box Cable Joint Gaskets | eBay
IEC Standard Electrical Knockout Box - China Chuqui Box, Junction Cajas | Made-in-China.com
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Steel City 4 in. Square Metal Box 1/2 in. and 3/4 in. Knockouts 521511234EW-50R - The Home Depot
RACO 8650 Handy Box, 1-Gang, 11-Knockout, 1/2 in Knockout, Steel, Gray | HardwareStore.com
Raco Electrical Box, Handy, 1/2 in. Knockout 681 | Zoro
Steel City 1-Gang Metal Electrical Box Cover with 1/2 in. Knockout 58C6-25R - The Home Depot
