Counterbore Plug, (Ød2)3.4mm to (Ød1)5.1mm, Silicone (Green), Pack of 10, HDCS51-P
SGD $11.70
Solid and durable, every plug fits a range of hole diameters. Use them for threaded holes or holes before dowel pin installation. The counterbore ensures that the area around the hole is protected too.