Amazon.com: 4 Pcs 4 Hole Bent Tee 90° Fitting Connector Fit for ½" Bolt in 1-5/8" Strut Channel, T Shaped Bracket Thickness 4.7mm Carbon Steel : Industrial & Scientific
N219EG N 219EG Superstrut 4-Hole Flat 90
Amazon.com: Genuine Unistrut P1325-EG 4 Hole 90 Degree Angle Connector Bracket for All 1-5/8" Strut Channel : Industrial & Scientific
Amazon.com: 4 Pcs 4 Hole 90 Degree Wing Shape Strut Channel Fittings Bracket, Fit for 1/2" Bolt in All 1-5/8" Strut Channel, Right and Left Strut Connector, Thickness 5.7mm (4 Gauge) : Industrial & Scientific