Hollow Cylindrical Plug For M20 Screw Hole, ØD18.4mm, 21mm Long, Silicone (Black), Pack of 10, HCAS20-P
SGD $29.70
The hollow structure enables each masking cap to be flexible and usable for shaft ends. The flange covers the area around the hole, while every plug comes with a knob for easy installation and removal.