50pcs M4 Threaded Grooved Body Flat Head Blind Rivet Nut Rivnuts Insert NutsertsCategory: Groove InsertFlat head cap screws, M4 female thread diameter, 11mm total length, zinc plated surface,carbon steel rivet nut.This nutsert has a large flange to provide increased strength in punched and drilled holes.Knurled body provides a higher resistance to spin out when installed in soft materials.WHAT IS A ?A fastener is a tubular rivet with internal threads. It can be installed in seconds form one side of thework. Once installed, no finishing work is required on the fastener. The added benefit of not only being a dependable fastener, they are ready to use with clean threads available for screw attachments.Blind thinsheet materials that are too thin for a tapped thread. Blind Rivet Nuts also areused when an application has little or no access to the backside as they can be installed from the front side of the work piece.For CALIFORNIA residents only: WARNING: This product contains chemicals including DEHP, which is known to the State of California to cause cancer and birth defects or other reproductive harm.Please note that by posting this Proposition 65 warning, we are notifying you that one or more of the Proposition 65 listed chemicals may be present in a product. With Unique Bargains' products, the exposure to these chemicals may be of no significant risk to you, but out of caution, we have elected to place this warning on our site to make sure our customers are informed.You can find more infomation at http://www.oehha.ca.gov/proposition-65/about-proposition-65.