Product Details:

CRL ACRS Straight Tee Adaptors are used to join posts and horizontal railings together to form 90 degree intersections. Simply attach the Adaptor with the 1/4 inch -20 socket head cap screw and rivet nut supplied to 1-1/2 inch Schedule 40 Aluminum Pipe. A 27/64 inch hole needs to be drilled for the fastener. Then slip the intersecting pipe over the tanged end of the Adaptor and tighten the internal set screw to secure. Drilling a 27/64 inch hole into the intersecting pipe accesses the set screw.