There are vent holes on the housing, high heat dissipation for cooling the operating mechanism from overheating. It can be used for surface conditioning and grinding or iron cutting, and home improvement. Wide applications, perfect for polishing, grinding and cutting ceramic tile, wood, stone, steel and etc.. Easy to swap grinding discs with the humanized design spindle lock. Conform to human engineering handle design, one-hand operation, convenient side toggle switch for easy grasping and use., Manufacturer: QAXRZCUCD