These climbing hanger replicas aka practice bolts,  use a combination of strong magnets and nano gel to adhere to any magnetic surface temporarily.  The sticky gel surface is reusable, so peel them off and place them again wherever you want. Practice crucial skills of climbing like anchor building and cleaning.
rock climbing
canyoneering
rescue
rope access
professional arborists
Two Bolt Anchor Kit includes 2 Practi Bolts, 2 quicklinks, 2 rings,  2 chains.