Prime-Line #10-32 x 5/16 in. 3-Prong Zinc Plated Steel T-Nuts (20-Pack) 9077897 - The Home Depot
Amazon.com: NGe M8 x 10mm T-Nuts, 4-Prong Tee Nut Fasteners, Pronged Tee Nut for Wooden Furniture and Climbing Hold, Pack of 100 : Industrial & Scientific
F13037Z ROLL IN T-NUT W/ BALL SPRING SA 1/4-20 SLOT 8 ZINC PLATED STEEL
Drop-in T-nut for 3030 extrusion fully printable for M3 M4 or M5 threads by cmh | Download free STL model | Printables.com
Hillman 1/4-20 x 5/16 in. x 3/4 in. Stainless-Steel Pronged Tee Nut (25-Pack) 4149 - The Home Depot