4.2-1.41 x 16mm Indented Hex Head: 7mm Outside Diameter12mm Loose Washer Black Finish Tek® Screws Compare with: G.M. # 11503578, 11503785, Auveco # 18261, Disco # 12816PK, Disco # 12816B, Kimball / Midwest # 12097, Kent / Lawson # P62003, Winzer # 502.12041, Wurth # 150159455