Hitachi S18SB 6.2-Amp 7-Inch Vertical Disc Sander Vertically positioned design for improved balance and control High overload durability prevents burnout during aggressive sanding operations Dust-resistant bearing chamber, metal bearing bushing, double insulation, and wear resistant tail cover add durability and prolong service life Elastomer covered pistol-grip and side handles provide a secure and comfortable grip Trigger lock-on button reduces user fatigue during continuous use