Sheri, Thank you for your question on the Delta Portwood 24 in. Towel Bar in SpotShield Brushed Nickel. The projection of the bar is 3.37". Best, Customer Care Team
Follow this link and you can view the instructions. https://images.homedepot-static.com/catalog/pdfImages/4b/4b7dbf18-43c8-4e6f-83b0-dd0a7a74a3a0.pdf
A little smaller than 3/4 inch.
I have mine installed in the shower and it gets wet when showering, I have not had any issues with it getting wet going on a year now.
From the information provided it come in 18 & 24 inches.
KP, This one come in 18 and 24 inches. If these lenghts will not work and you have the proper tools to do this safely, go for it. I'm sure that Delta would not recommend you do this for safety and integrity reasons.