[Wide Compatibility]Vacuum accessories fit most vacuum cleaners (not all). The Vacuum Adapter Kit includes a 6.5cm to 3.8cm vacuum hose adapter and a 4.7cm to 4.5cm vacuum adapter, giving you a wide range of applications to meet all your different needs for daily cleaning, suitable for most vacuum cleaners. with 2 1/4 inch ID shop vacuum fittings. [2.5 inch (~6.3cm) to 1.25 inch (~3.8cm) Vacuum Hose Adapter] Fits most 2.5 inch (~6.3cm) and 1.25 inch (~3.8cm) hose systems. The 2.5 inch (~6.4cm) to 1.25 inch (~3.2cm) reducer allows you to use all 1 1/4 inch (~6.4cm) ID vacuums. The big end measures 2.45 inches (about 6.2 cm) outside diameter and 2.25 inches (about 5.7 cm) inside diameter. The small end is 1.25 inches (about 3.0 cm) long and 1 inch (about 2.5 cm) inside diameter. [5-Layer Universal Vacuum Adapter]The rubber vacuum adapter can be easily cut into 5 sizes of connectors to meet your different needs. The outer diameter of the 5-layer adapter is 27mm, 32mm, 35mm, 40mm, 50mm.