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: M8x1.25mmDrill Hole Size (+/-0.1): 11mm/0.43"Total Size: 30 x 19mm/1.18" x 0.75" (L*Max.D)Package Content:5 x Rivet Nuts