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10/50/100pcs Rectangular Plastic End Caps for Steel Tubing - Big Range of Sizes | eBay
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QWORK 10 PCS 1" X 2" Rectangle Black Plastic Plug End Cap for Pipe Tubing, Chair Leg - Amazon.com
2" X 4" Rectangle TUBING END Cap Plug - Quantity of 4: Amazon.com: Industrial & Scientific
40x80/50x100/50x80 Rectangle Tubing Insert Plastic End Cap Finishing Plug Oblong Hole Insert - Furniture Cups - AliExpress
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LED Aluminum Extrusion Cap for .2" deep rectangular shaped Extrusions
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Rectangular Plastic End Cap 1-1/2in x 2in Rectangular | T28-U2-BK-25
Rectangular Plastic End Cap 1in x 2in Rectangular | P64-U96-WH