Internal Thread Insert Type: 5/16"-18, Pitch Size 18 Threads per Inch, nut external diameter: 13mm, total length: 20mm.
Suitable for furniture hardwood / solid wood / furniture combinations.
Usage: Make a hole smaller than the outer diameter of 0.2-0.5mm, depth is 1-2mm longer than furniture screw, then screw it into the hole with the internal hex wrench!
Advantage: Carbon steel galvanized, strong and durable.
Package included: 20 x furniture screws threaded inserts.