1. [Wide Compatibility] Our vacuum cleaner attachments are suitable for most vacuum cleaners with a universal vacuum cleaner adapter kit (not suitable for shop vac accessories with an inner diameter of 2 1/4 inches). The vacuum cleaner adapter kit includes a 2 1/2' to 1 1/4' vacuum hose adapter and a 1 7/8' to 1 3/8' to 1 1/4 to 1' vacuum cleaner adapter, which can provide you with a wide range of applications to meet your different needs of daily cleaning and is suitable for most vacuum cleaners. It does not fit shop vac accessories with an inner diameter of 2 1/4 inches. 2. [Great for Cleaning Different Surfaces] The 12-inch wide vacuum brush attachment with a 360-degree swivel head is ideal for wooden floors, tiles, leather furniture, walls and ceilings. The round horsehair vacuum brush is ideal for cleaning hard surfaces such as countertops, dusting tables, vertical blinds, etc. The detachable utility nozzle and upholstery tool brush are suitable for soft or uneven surfaces and will not damage objects such as curtains, sofas, lighting fixtures, etc. 3.[Suitable for Small Corners] The flat-head crevice tool can effectively remove dust and fine particles from narrow gaps and small corners, such as dryer vents, corners of sofas, cars, etc. The handy little tool brings more convenience to your cleaning work. 4.[Universal Vacuum Adapter Kit] The 5-layer universal vacuum adapter can be easily cut into 5 sizes of connectors to meet your different needs. Suitable for shop vacuum cleaner accessories with inner diameters of 1'(25.4mm), 1 1/4'' (32mm), 1 3/8'' (35mm), 1 1/2''(39mm), 1 7/8''(49mm). 2 1/2' to 1 1/4' vacuum hose adapter allows you to connect all 1 1/4' inner diameter vacuum cleaner accessories with 2 1/2' inner diameter vacuum cleaners. The large end outer diameter is 2.44', and the inner diameter is 2.26'. The small end has an outer diameter of 1.18' and an inner diameter of 1'.