Open/closed bushings Feature: Material: Nylon66 engineering plastic . good insulation and anti-aging. Color:Black Open/closed bushings:Instr:ModelMounting Hole Diameter D mmHead Diameter B mmInside Diameter A mmOverall Height C mm0813C12.5-1314.6910.11216C15.5-1617.81210.51419C18-192114.411 Open/closed bushings