"No Hex Key?:" # `; ~/ c! T; F( H5 O4 M 0 C3 n$ `+ `! s0 G1/2 3/8 1/4 inch rod couplings can be used in a pinch if you need a hex key or allen wrench. insert rod coupling into hex opening in lug set screw and turn with wrench. 0 y# R% b; C3 U& ~& s3 v