This 7.6 meter retractable belt has a strong magnetic base & belt clip making it particularly useful in situations such as warehouse aisle closures where only steel pallet racking is available to mount the retractable belt, in the case of pallet racking simply push base onto the upright of racking, attach the safety bungy clip into a hole on racking (this prevents the unit from damage if the magnetic base is accidently knock off) pull the belt out across the aisle and push the belt onto the opposite racking.