Specification: Size: 6.3x4.8x8.4mm Quantity: 2pcs/10pcs Application : Suitable for Dremel 4000.Install method: Step 1: Use the wrench to open the cover of carbon brush. Step 2: Take out the carbon brush. Step 3: Replace with the new carbon brush. Step 4: Use the wrench to lock the cover well. Package Included: 2/10 x Carbon Brushes Dear buyers, we appreciate your business, if you are satisfied with our service, please leave us a positive feedback and rate the details of the transaction (Detailed Seller Ratings) with a ''PERFECT 5 STARS''. If you have any problems, broken, quality problems, please don't worry, and don't leave bad feedback. Please send us an email first, we will reply you as soon as possible, please allow us to respond within 12 hours. We understand your mood, and will provide you with the best solution for your problem, please give us the opportunity to solve the problem, For any case,please feel free to come to us,we are always here. look forward to and thank you for your trust. _x000D_ _x000D_