Polisher (Single Extension) 1 hp, Straight-Line, 3,400 RPM, Rear Exhaust, 1/2 Inch-20 Spindle Thread Includes 1/2 Inch-20 Male Threaded Adapter (53549) Extension Grinders allow operator to extend into work pieces and reach lengthy distances. Extension length of 8-3/8 allows longer reach than competitive models! Extensions are constructed of steel for maximum durability. Designed for minimal vibrationExtensions do not spin during tool use, so continuous tightening is not needed (as with some one-piece shaft-type extensions). Tools can also be fitted with optional Buffing Pads, optional collets and inserts, plus optional Cone/Plug Wheels(Note: Speed of tool must not exceed maximum operating speed of accessory.) Part # 53521 Sold in qty's of 1 Height 1/2 Inch Country of origin United States Product type Buffers & Polishers Set Qty 25