A Climber’s Kit includes boot tips, gloves, pitons, and a harness. As a Utilize action, you can use the Climber’s Kit to anchor yourself; when you do, you can’t fall more than 25 feet from the anchor point, and you can’t move more than 25 feet from there without undoing the anchor as a Bonus Action.
RollQuest ships the D&D 2024 SRD as a content pack, on a 5e character sheet that does the maths - roll from the sheet and let the numbers work themselves out. Free to start.