rubber grommet is usually used. When a wire must go through a hole in metal, a two-piece plastic grommet can be used.
Blind Rubber Grommets from China manufacturer - Better Silicone
Rubber Grommets and Isolation Bushings help eliminate direct contact of dissimilar metals.
Rubber Tower Type Protection Coil Snap in Grommet Pad Seal Ring O-ring Protective Ring Sealing Cap Hole Plug Wire Guard Ring - AliExpress
Rubber Grommet Molding, Design, and Engineering
Car Parts
Philmore 10-049C Rubber Grommet, 1/2 x 3/4 , 100 Pack
Multicolor Silicone Rubber Grommet, For Automobile at Rs 2/piece in Gurgaon
Cable Grommets How it works, Application & Advantages
A Complete Guide to Rubber Grommets