1/4"-20 Furniture Screw in Nut Threaded Insert Nutsert for Wood Furniture Connector 15mm Length
Made of carbon steel.
Hex Drive:6mm.
Drilling Hole: 3/8" / 9.5mm drill bit.
▲▲SIZE of drilling hole depends on the Hardness of The Material, if your wood is very soft, you can drill a smaller hole, but in really hard wood, you will need bigger drilling bit.
▲▲We recommand Test by decreasing or increasing the drilling size till you find the proper size that works for the hardness of wood.