General description Our versatile vacuum cleaner attachments are designed to fit most vacuum models (not compatible with accessories that have a 2 1/4 inch inner diameter). This kit includes a 2 1/2 inch to 1 1/4 inch vacuum hose adapter and a 5-layer vacuum adapter, making it suitable for various attachment sizes. Technical specifications Includes: 2 1/2 inch to 1 1/4 inch vacuum hose adapter Compatible with inner diameters: 1 inch (25.4mm), 1 1/4 inch (32mm), 1 3/8 inch (35mm), 1 1/2 inch (39mm), 1 7/8 inch (49mm), and 2 1/2 inch (63.5mm) Measurement allowed error: +/- 1-3cm Compatibility and accessories 2 1/2 inch to 1 1/4 inch vacuum hose adapter 1 7/8 inch to 1 3/8 inch to 1 1/4 inch to 1 inch vacuum adapter 1 1/4 inch horsehair vacuum brush 1 1/4 inch flexible crevice tool 1 1/4 inch vacuum crevice tool 1 1/4 inch upholstery tool attachment 1 1/4 inch utility nozzle with removable plastic brush 1 1/4 inch brush & nozzle combination tool Installation Easy to attach and detach,