Conical Plug For M12 Screws, Ød9 to ØD12, 19mm Long, Silicone (Red), Pack of 10, HBAS120-P
SGD $10.80
Conical plugs can be used for a range of hole diameters. Choose one with the right top and bottom diameters to fit the hole size. Simply leave enough length clearance for easy installation and removal.