Conical Plug For M12 Screws, Ød7.9 to ØD12.7, 25mm Long, Silicone (Tea), Pack of 10, HBAS127-P
SGD $12.60
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.