This is a like-new Kodak Carousel Stack Loader No. B40. This allows a carousel projector to project slides without the use of a slide carousel. What you see is complete with stack-loader, instructions all in the original box and protective sleeve. ...approx 6" by 6", in like-new condition, box has almost no age wear and the protective sleeve has a bit of age rash. EKCo cat no 151 4249. Exceptional condition overall! Holds 40 2" x 2" slides.