uxcell 5Pcs 18mm Inner Dia Firewall Hole Electrical Wire Rubber Grommets

uxcell 18mm Cutting Diameter Hole Saw Drill Bit Cutter for Glass Tile

12-290 SCIENTIFIC GLASS 18MM BY 14MM DOWNSTEM STANDARD DIFFUSER CLEAR ASSORTED SIZES 6"

12-162 SCIENTIFIC GLASS 18MM BY 18MM DOWNSTEM STANDARD DIFFUSER CLEAR ASSORTED SIZES 3"

Diamond Drill Bit Set, Drillpro 10 PCS Glass Hole Saw for Tiles Glass Ceramic Marble Bottles DIY,6mm -- 30mm

Uxcell a15081100ux0612 14 mm Inner Diameter Rubber Electrical Round Wire Grommets Gasket 20 Pcs (Pack of 20)

12-539 SCIENTIFIC GLASS 18MM BY 14MM DOWNSTEM STANDARD DIFFUSER CLEAR ASSORTED SIZES 4"

14mm-18mm Glass Bushing Adapter

MFHX Handcrafted Glass items, replace bowl, male adapter, 14mm / 18mm (14mm, Blue)

12-173 SCIENTIFIC GLASS 18MM BY 14MM DOWNSTEM STANDARD DIFFUSER CLEAR ASSORTED SIZES 5.5"