Super Heavy Stakes for 4mm signs. 1/4" diameter base rods.
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Step Stakes Yard Sign Holders Black Sturdy & Reusable 50-1000 Pack Free Shipping | eBay
Hillman 23-in Steel Stake in the Sign Holders department at Lowes.com
COLMET Stake Sign Holder with 7"x5" Faceplate
7Penn Yard Sign Stakes Metal Sign Holder H Stakes for Yard Signs 10x30 IN 50pk - Walmart.com
H Frame Yard Sign Stakes Metal Sign Holder H Stakes for Yard Signs 10x16 Inch Metal Yard Sign Stakes - 5 Pack - Walmart.com
Metal Sign Stakes | Steel Steppers | Super Cheap Signs
Yard Sign Stakes, Holders & Stands | VistaPrint
Amazon.com : 7Penn H Frame Yard Sign Stakes Metal Sign Holder H Stakes for Yard Signs 10x20 Inch Metal Yard Sign Stakes 50 Pack : Patio, Lawn & Garden