extra coarse 3 refill rollers - the best fit for electric callus remover model V-601 for men and women Directions: We recommend changing the roller of your callus remover as needed for best results. Features: Easy to use Value for money Easy to install Reusable To replace: 1. Be sure the callus remover is turned off. 2. With one hand hold down the right-side release button, then lift the right side of the roller with the other hand to remove it. 3. To install the new roller, place one side of it into the groove. Confirm it's placed well into the groove, then press firmly. Do the same for the other side of the roller until you hear a clicking sound. Factory Original Replacement Head: The construction, performance work, manner, etc. of these refill heads are exactly the same as the grinding heads that come with the foot pedicure kit. 3 Different Coarse Levels: The extra coarse- for effectively removing even tougher hard cracked skin; The regular coarse- for softening and smoothing regular hard skin; The gentle coarse- for keeping your good daily maintenance and perfect finishing touch. Easy To Install: Just one step to replace the refill rollers; suitable for soft, hard, dry, and sensitive feet. (Notice: Check the roller head is securely attached to the device before use.) Safe & Effective: To remove the roughest and toughest calluses and keep your heel smooth and clean; Suitable for both men and women. 100% Satisfaction: It's perfect for model V-601, not for BK-506 of . If you have any question with the item, please contact team and we'll provide you a satisfatory sollusion.