the coupler 1 similarly hole 4 which is positioned about u00bd u2033 to about 1 u00bd u2033 from the other hole is aligned with hole 6 in the bottom 8 of the coupler 1 coupler pin 9 fig5 6 is comprised of a material that the does not chemically react with the coupler 1 the coupler pin 9 comprises a bridge 10 and two legs 11 and 12 the distance between the two legs can be about a half inch with ranges from about u00bc u2033 to about u00be u2033 in another embodiment for a large coupler pin 13 the bridge is longer being about 1 u00bd u2033 in length although the length may vary from about 1 u2033 to about 2 u2033 the length of the legs 14 15 of the larger coupler 13 or the legs of the small depends on the width of the coupler although the legs can be from about u00be u2033 to about 1 u00bd u2033 long with 1 u2033 also being acceptable the pins themselves range in width from about 0 100 inches to about 0 25 inches the pins are also a standard 0 125 u2033 in diameter the pins are made of a material that will not react with either the masonry reinforcement bar or the coupler 1 it should be noted that the bridge of the pin should be the same length as the distance between the holes of the coupler into which the legs of the pin are fitting referring to fig3 4 and 9 14 the ends 16 17 of the.