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The mokedo-factory Bearing Changer II is a special tool for easily replacing the 520 bearings built in in aluminum rollers used in mini 4WD Bearings will slowly dull when continued to use. It is a consumable item, and needs replacement and maintenance. When you didnt have this tool, some people have removed the bearing using counter gear or screws using the other parts, but it may fail over and over again until it can be safely detached and detached, and sometimes ruined the roller. This Bearing Changer II allows you to safely and securely attach and detach your bearings. When installing or removing the bearing, please be sure to slowly and relief. Faster screwing may cause bearings to enter diagonal or damage to the roller. The company participates in PL insurance (product liability insurance). Rest assured in case of unexpected injuries or accidents. Mokedo-factory is our registered brand. We strive to make this item a must-have for everyone. Compatible Roller Size: 0.5 inch (13 mm), 0.7 inch (17 mm), 0.7 inch (19 mm); Body Size: 1.2 inch (3 cm) x 0.6 inch (1.5 cm) x 1.0 inch (2.5 cm); Weight: Approx. 1.2 oz (34 g); JAN: 45734255819191912 oz (4 oz (3 g).