Flange Conical Plug (EPDM) for M10 to M12 Screw Holes, (Ød2)7mm x (Ød1)14mm, 11mm Long, EPDM (Black), Pack of 10, HBJE140-P
SGD $4.00
These masking plugs have a flange to protect the surrounding area around the hole from treatment processes. You may also use them for holes with small counterbores if the dimensions fit.