This vintage utility holder is leather and has a magnetic closure and clips on.  It measures 4 inches wide by 2.25 inches high and is 1.5 inches deep.  The Styrofoam insert 3.75 inches by 1 15/16 inches and 5/8 inches deep.

This is from a deceased relative’s collection of things and has been in storage for decades.

This is item number 6756