URBEST 304 Stainless Steel Rivet Nut Flat Head Insert Nutsert Knurled Body Blind Rivnut Assortment 50Pcs (M4x11mm);

Flat head cap screws, M4 female thread diameter, 11mm total length, 304 stainless steel rivet nut.
The Nutsert has a flange to provide increased strength in punched and drilled holes.
A Rivet Nut fastener is a tubular rivet with internal threads.It can be installed in seconds form one side of the work. 
Once installed, no finishing work is required on the Rivet Nut fastener. The added benefit of not only being a dependable fastener, they are ready to use with clean threads available for screw attachments.
Knurled body provides a higher resistance to spin out when installed in soft materials.
Package Content: 50(+/-2%) pieces x Rivet Nuts M4x11mm