Check the listing for details. 100Pcs 5/16"-18UNC Zinc Plated Carbon Steel Flat Head Rivnut Threaded Insert. Condition: New. Listed at 16.85 USD. MaterialZinc Plated Carbon SteelFastener TypeSocket HeadExterior FinishZincMetal TypeAlloy Steel, Carbon SteelBrandGlarksAbout this itemRivet Nut Size:In this set, it include 100pcs 5/16"-18UNC rivet nuts for your work, which drill hole size is 10.8mm/0.43'', total length is 18.5mm/0.72''.Feature:Head Type: Flat Head; Color: Yellow. Nuts have a work-hardened surface providing high-strength, load-bearing threads.Durable Quality:All the rivet nut are made of carbon steel, with zinc plated on the surface, strong and durable, you will no longer worry about them rusting and breaking when installing.Multipurpose:It can be used for fixing in many different kinds of material including steel, fiberglass and plastic, etc. Application:Perfect for automotive, furniture, decoration and other electrical and industrial products. Product SpecificationsNumber of Items100Size5/16"-18UNCSpecification MetSpecification for this product familyBrand NameGlarksExterior FinishZincMaterialZinc Plated Carbon SteelMeasurement SystemMetric , InchNumber of Items140Opposing Screw SizeM6Outside Diameter5 millimeters millimeters Product DescriptionGlarks 100pcs carbon steel flat head threaded rivetnut insert nutsert rivet nut set Specification:Head Type: Flat HeadColor: YellowMaterial: Zinc Plated Carbon SteelRivet Nut Size: 5/16"-18UNC About our rivet nut:These rivet nuts are suitable for a variety of thickness of the material including steel, fiberglass and plastic, etc, riveting firm with high efficiency, easy to use. Application: Perfect for automotive, furniture, decoration and other electrical and industrial products Package Details: Thread ------------ Drill Hole Size -------- Quantity5/16"-18UNC ----------- 0.43'' ------------- 100pcs Note Please check the specific size of the product according to the second picture. Due to manual measurement, there may be errors, please don't mind.