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