The Mini Split-Shoe is provided with a 2-1/2" quick connector compatible with most shop vacs. The Mini Split-Shoe is much smaller (8”x4.75”) compared to our standard shoe (10.5” x 6”). This new shoe is engineered for smaller machines and is provided with a 2-1/2” quick connector that is compatible with most shop vacs. When ordering, select either the 2" or 3" brush ring. See below to determine which brush ring you need.