Feature: Pre-bulbed design requires less installation load. Fastens in Blind Holes with Knurled Body for Anti-Rotation. Specification:Material: Carbon SteelFinish: Color-Zinc-PlatedThread Size: M5x0.8mmDrill Hole Size (+/-0.1): 7mm/0.28"Total Size: 22 x 13mm/0.87" x 0.51" (L*Max.D)Package Content:10 x Rivet Nuts