1/4"-20 threaded insert wood insert furniture screw in nut connector screws <br><br> <br>Thread Type: 1/4"-20 <br>Total Length: 15mm <br>Insert head diameter: 11.7mm <br> Insert Threads Diameter: 10.4mm <br>Body Diameter: 0.315" / 8mm.<br>Material: carbon steel, zinc plated <br><br> <br><b>▲▲▲ -Suggested Drilling Hole for Soft Wood: 8.5mm, 9mm, 3/8". <br>▲▲▲-Suggested Drilling Hole for Hard Wood: 3/8", 10mm. <br> <br> <br>★★★NOTE: SIZE of drilling hole depends on the Hardness of the Material★★★ <br> <br>★★★Please drill a proper hole, test to check if inserts fit appropriately.</b> <br> <br>★★★ ★ 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. <br> <br>★★★ ★ 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. <br>If the drilled hole is too small for the threads, screwing it in MAY split the wood or insert. <br> <br>Package comes with 40pcs wood insert nut + 1pc 6mm allen wrench.