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J.W. Winco A80192 DIN508 T-Slot Nut, M20 x 24 mm, Steel: Amazon.com: Industrial & Scientific
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M8 x 20mm T-Slot Drop-in Stud Sliding Bolts T Shape Screws, 304 Stainless Steel 18-8, Full Thread, 20 PCS : Industrial & Scientific - Amazon.com