Unistrut P2225 8-Hole Wing Shape Fitting for 1-5/8-Inch Strut Channel NONE Imported Thickness: 1/4" (6.4mm) with steel meeting or exceeding ASTM A1011 SS GR 33, or 0.220" (5.6mm) with steel meeting or exceeding ASTM A1011 HSLAS GR 45 8 Hole Wing Shape Ninety Degree Fitting Corner Bracket for 3 Way Channel Cross Section For Use With 1/2-Inch bolt in all 1-5/8-Inch Series Strut Channels Hole Diameter: 9/16-Inch (14mm) Finish: Electro-Galvanized; ASTM B633, Type III