Hillman 1/4-in x 20 Zinc-plated Steel Wood Insert Nut (4-Count) in the Lock Nuts department at Lowes.com
Set of 50 threaded inserts (screw-in nuts, M6x10 mm) - Wood, Tools & Deco
50pcs 1/4-20 Threaded Insert for Wood Furniture Insert Nuts Screw in Nuts 3/5" Length: Amazon.com: Industrial & Scientific
Insert Nuts For Wood Type E | Fastenright Ltd
Early Education Educational Screw Nut Assembling Wooden Toy Solid Wood Screw Nut Hands-On Teaching Aid Educational Toy For Child - AliExpress Toys & Hobbies