Beamline 11-BM is a dedicated high-resolution powder diffractometer at the APS. It offers high resolution powder diffraction data (< 1.2 x 10-4 Δd/d) over moderate time scales (10 minutes – 1 hour). Beamline 11-BM offers both on-site and mail-in modes of access. On-site experiments allow for a wide variety of sample environments, including variable temperature (5 K – 1800 C), electrochemical cells, and gas flow and loading.