Features: 21V lithium battery motor 775 type motor with 5MM shaft compatible with lithium battery. Suitable for angle grinders, hair dryers, and grinding machines. Specifications: Product name: Lithium Battery Motor Color: Silver Material: Metal Package Contents: 1 x Lithium Battery Motor Note: Installation guide not included. Professional installation is strongly recommended. Please verify compatibility to ensure the item meets your needs. Product design may vary slightly between batches, including minor color or appearance differences, which do not affect functionality. Light reflection and display settings may cause slight color variation between the image and the actual product. Measurement error allowed is +/- 1-3 cm. Only the items listed above are included; other accessories are not part of the package.