DREMEL POWER TOOLS Carbon Brushes to fit 398 400 Series Carbon Brush Set for Model 398 / 400 PART Ref: 2610907940 ( 2 610 907 940) size 4.7 x 5.1 x 11 mm YOU WILL GET ONE PAIR (TWO) CARBON BRUSHES These are replacement carbon brushes which go under under the brush cap and rest on the armature Open the brush caps and remove the old carbon brushes Easy to replace Always replace both together You can use find sandpaper on these brushes to smoothen them if/as required Easy to replace Amazing what difference these can make - It is recommended that you should change your carbon brushes after about 60 hours of use makes them like new and gives it a strong and responsive like new effect Buy from a reliable and reputable seller - Prompt and immediate delivery Please ensure that the Commutator is clean not abrasive. Always wear protective eyewear gloves. Keep children away. Original Brand names/makes/model numbers are given for comparative purposes only the rights of all registered trade marks are recognised and respected. These are non-oem High Quality consumable replacement parts which can fit many tools equipments. No liability is accepted for any damage or injury. We offer goodwill 30 days Return for full refund or free exchange. Thank you AND NOW THE LEGAL STUFF ? We are not agents of the Manufacturers and respect and recognise their name and trade mark and ownership of title for their products. These are generic high quality replacement consumable parts which fit many tools in these size brushes and we clearly state that these are not OEM and we are not directly or by implication dealers or agents for these respected brands.