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Amazon.com : Shuokecrafts 5Pack Top-Binding Rings Binder Mechanism,2 D-Rings, 30mm Inner Height, 26mm Base Width,133mm= 5 .24 inch Overall Length, Used for 8.5” Edge of a Letter Size Page, No Boosters :
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uxcell 304 Stainless Steel Welded O Ring 30mm(1.18") Outer Dia. 5mm Thickness 6pcs - - Amazon.com
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uxcell Nitrile Rubber O-Rings 33mm OD 30mm ID 1.5mm Width, Metric Sealing Gasket, Pack of 10: Amazon.com: Industrial & Scientific
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uxcell Nitrile Rubber O-Rings 30mm OD 27mm ID 1.5mm Width, Metric Buna-N Sealing Gasket, Pack of 10: Amazon.com: Industrial & Scientific
uxcell Nitrile Rubber O-Rings, 36mm OD 30mm ID 3mm Width, Metric Sealing Gasket, Pack of 10: Amazon.com: Industrial & Scientific
