Conical Plug For M5 to M6 Screws, Ød3.2 to ØD6.4, 19mm Long, Silicone (Green), Pack of 10, HBAS64-P
SGD $4.00
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.