For use in hand lift applications only. Multiple vacuums used on a single load can only improve handling. If using more than one vacuum tool the ratio of maximum lift capacity does not increase. To lift heavier weights a larger vacuum must be used. All are fitted with a rubber suction which will not damage contact surface during the lifting action. For use on glass, tiles, plastic or other smooth surfaced non-porous material and can also be used for pulling out dents. Hand lift only, must not be used in conjunction with mechanical lifting equipment.