Description: This product is suitable for dust cover, compatible for BL1830 BL1840 BL1850 BL1860 BL1890 batteries. It can be used on for lithium batteries to protect the battery from dust and prevent oil and water from entering and causing a short circuit of the battery. Note: battery cover only size: 94mm x 61mm x 25mm Material: plastic colour: translucent Package Contents: 20 x Dust cover (battery not included) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.