Amcraft Purple Male Shiplap Duct Board Tool

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The Purple duct board tool is a handheld device that is used to carve out a Male Shiplap cut in fiberglass duct board. The Purple Duct Board Tool is used to make a male shiplap or reverse shiplap end cut.

The Purple kerfing tool can only be ordered for 1" thick Fiberglass Duct Board.  Please refer to the Yellow Tool for 1-1/2" and 2" thick fiberglass duct board options.

The difference between the 1" Purple and the 1" Yellow tools is the width of the male shiplap cut.  The Purple Tool cuts a narrower 7/8" wide cut while the Yellow Tool at 1" thickness cuts a 1-1/4" wide cut.


1" Purple Tool: 7/8" wide x 1/2" deep male shiplap cut

*Replacement Blades for the Purple Duct Board Tool are available for purchase.


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