Flexible Rubber 1 3/8" x 1 1/2" Dust Collection Fitting By Peachtree Woodworking PW521 1 3/8" x 1 1/2 " OD By 1 1/8" x 1 1/4" 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