I plan to fence my property with driven metal T-posts (max cross section 1.45”). A section of it goes across a granite rock outcropping. This in the area near Stone Mountain in Georgia. I plan to buy a Bosch SDS-MAX 15amp rotary hammer for the job. I want to drill a 1.5” hole 24” into the rock and set the T-post with Sackrete . I likely have 50 holes to drill. Am I better off going with a Carbide bit (Bosch HC5092) , or a diamond one? And I don’t have a link for one. Suggestions welcome.