Dynabrade 52850 0.1 hp Straight-Line Variable Speed Pencil Grinder, 35-60,000 rpm, Rotary Vaned Air Motor, 1/8" Collet Dynabrades Variable Speed Pencil Grinder offers precision deburring, finishing and engraving, with easily adjustable speed to suit each application High-Quality Air Line; 1/4" in diameter and 5 feet in length. Over-hose Assembly; Helps direct air and excess oil away from operator - 12" in length Ergonomic Tactile Grip; for comfortable use. Large Precision Bearings; Ensure longer tool life than competitive models. Spindle Lock Allows Easy Collet Tightening 0.1 hp Straight-Line Variable Speed Pencil Grinder, 35-60,000 rpm, Rotary Vane Air Motor, 1/8" Collet