Flexible Rubber 1 1/2" x 1 5/16" Dust Collection Fitting By Peachtree Woodworking PW522 1 1/2" x 1 5/16 " OD By 1 1/4" x 1 11/16" ID Will stretch, flex and give allowing a tight connection Use to connect many different small power tools to your dust collection system Great for odd sized tool openings