| 
 | The ornamental design for a sheet rock t-square holder, as shown and described. | |||||||||||||||||
FIG. 1 is a front, top and side perspective view of the sheet rock t-square holder showing my new design;
FIG. 2 is a front end elevational view thereof;
FIG. 3 is a rear end elevational view thereof;
FIG. 4 is a side elevational view thereof;
FIG. 5 is a side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
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