The 5-layer vacuum adapter size is 27mm, 32mm, 35mm, 40mm, 50mm, fits for 1 inch,1 1/4 inch,1 3/8 inch,1 1/2 inch,1 7/8 inch universal vacuum attachments. Not Fit for accessories with 2 1/4 inch inner diameter The vacuum cleaner attachments includes 27mm/1inch to 50mm/2inch Vacuum hose adapter, 1 1/4 inch wet or dry vacuum crevices tool, 1 1/4inch 2-in-1 Brush and nozzle combination tool, 1 1/4inch Flexible crevice tool, 1 1/4inch Sofa , 1 1/4inch Utility nozzle with brush, 1 1/4inch Horsehair round brush 32mm 1 1/4 inch inner diameter brush fits most robot vacuums, the 1 1/4 vacuum attachments kit is compatible with for , for Royal, for Dirt, for Devil, for , for , for etc. Please carefully check the vacuum clear accessory size The vacuum attachments & brushes are very flexible and , can clean keyboards, desks, bookshelf, pet hair, sofas, beds, floor, curtains, , air conditioning, cars, slides and so little nooks and crannies of the place and countertops The vacuum accessories for attachments can be used for wet or dry pickup. Easy to attach and detach, no tools required.