Dumbbell base

FIG. 1 shows a front perspective view of a dumbbell base in accordance with the present design;

FIG. 2 shows a top view of the dumbbell base of FIG. 1 ;

FIG. 3 shows a front elevation view of the dumbbell base of FIG. 1 ;

FIG. 4 shows a rear elevation view of the dumbbell base of FIG. 1 ;

FIG. 5 shows a left elevation view of the dumbbell base of FIG. 1 ;

FIG. 6 shows a right elevation view of the dumbbell base of FIG. 1 ; and,

FIG. 7 shows a bottom view of the dumbbell base of FIG. 1 .

The broken lines illustrate portions of the dumbbell base that form no part of the claimed design.