https://www.homefixated.com Grip Tite Sockets enable you to remove rounded nuts and bolts that other sockets can’t grip.
https://www.renvu.com/Solar-Products/Solar-Roof-Attachments/QS-5-25in-QB-3in-EPDM-Composition-Asphalt-Shingle-Roof-Flash
How to Install:
QS 5.25in QB 3in EPDM Washer Flashing for Composition Asphalt Shingle Roof with L-Foot
Kit includes:
5.25″ by 5/16″ in diameter stainless steel hanger bolts
5/16″ Hex Serrated Flange Nuts
3″ by 5/16″ BLACK stainless steel backed EPDM compression washers
aluminium L-Foot
Weight: 6.2 lb
Use 6mm (M6) Deep Socket Hex Driver to drive or remove the hanger bolt into the rafters