Inside Diameter (in): 0.14 Notes: Dimensions and Material Descriptions provided for reference only. Material: NBR - Nitrile / Steel Primary Sealing Material: Rubber Fastener size (in): 6/32 Outside Diameter (in): 0.39 Steel Thickness (in): 0.04 Material Description: NBR is a versatile material with good abrasion and cut resistance. It works well in Air, Engine Oil, Diesel Fuel, Coolant/Urea, Hydraulic Oil and Automatic Transmission Fluid applications. Do not use with Biodiesel.