Made out of steel, it offen to be put inside the MDF board, or other hard wooden plate, you usually use it with screws, widely used in wooden furniture industries and office furniture system.
1. Diameter: M4-0; M5-0.8; M6-1.0; M8-1.2; M10-1.5.
2. Length: standard size; there is not many choice for each diameter.
3. Material: carbon steel.
4. Coating: upon request.