Features: 21V lithium battery motor 775 type motor with 5MM lithium battery compatibility. Compatible with angle grinders, hair dryers, and grinding machines. Specifications: Product name: Lithium Battery Motor Suitable for: angle grinders, hair dryers, and grinding machines Color: Silver Material: Metal Package Contents: 1 x Lithium Battery Motor Note: Only the above package content is included; other products are not included. Installation guide not included. Professional installation is strongly recommended. Please verify compatibility to ensure the item meets your requirements. Product design may vary slightly between batches, including minor color or appearance differences, which do not affect functionality. Due to lighting effects and monitor settings, actual color may vary slightly from image. Measurement error allowed: +/- 1-3 cm.