Sprite Science 1/4-20 Hex Drive Threaded Inserts for Wood - 40 Pieces

1/4"-20 threaded insert wood insert furniture screw in nut connector screws Thread Type: 1/4"-20 Total Length: 15mm Insert head diameter: 11. 7mm Insert Threads Diameter: 10. 4mm Body Diameter: 0. 315" / 8mm. Material: carbon steel, zinc plated-Suggested Drilling Hole for Soft Wood: 8. 5mm, 9mm, 3/8".-Suggested Drilling Hole for Hard Wood: 3/8", 10mm. NOTE: SIZE of drilling hole depends on the Hardness of the Material Please drill a proper hole, test to check if inserts fit appropriately. In Softer wood, the outside threads cut easily into the wood, simply drill a proper hole size (8. 5mm, 9mm, 9. 5mm, 3/8" drill bit) for the body of the insert, then screw insert into the place. In very Harder wood such as white oak or maple, drill a hole size (3/8", 9. 5mm, 10mm drill bit) that close to the outside threads diameter. If the drilled hole is too small for the threads, screwing it in MAY split the wood or insert. Package comes with 40pcs wood insert nut1pc 6mm allen wrench.