【Package Included】#5140033-19 , 8 carbon brushes Per Set 【Dimensions (L x W x H)】0.72" x0.67" x 0.27" 【Compatibility】Suitable for DW745 DWE7480 DWE7490X DWE7491RS DWE7499GD 【Non-original Parts】Change the carbon motor brush use the original spring is a better choice. 【Note】Worn brushes are often the cause of a poorly running motor, new brushes can restore a motor's electric braking.replace every 60 hours or the electric rotary tool over heating.