ITEM NAME:Marine 316 Stainless Steel Clamshell Vent / Wire Cover Clam Shell Vent for Boat Description: Stainless Steel Clam Shell Vent Marine Grade, Mirror Surface Polished UV and weather resistant and great for routing cables, wire, etc. Dimension: approx. 4 x 4.5cm / 1.57 x 1.77 inch Hole Diameter: approx. 3mm / 0.12 inch Color: Silver Package Includes: 1 Piece Clam Shell Vent.Stainless Steel Clam Shell Vent. 1 Piece Clam Shell Vent. Marine Grade, Mirror Surface Polished. UV and weather resistant and great for routing cables, wire, etc. Color: Silver.