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: M10x1.5mmDrill Hole Size (+/-0.1): 13mm/0.51"Total Size: 33 x 22mm/1.3" x 0.87" (L*Max.D)Package Content:10 x Rivet Nuts