Dremel 400-3/55 400-Series XPR 2-Amp 5000-to-35000-RPM Variable Speed Rotary Tool with 55-Accessories Variable speed provides maximum control and precision Permanent magnet motor for-increased performance and consistent speed at all speed settings Ergonomic, contoured styling with soft-grip areas for greater comfort and control. Lightweight design for comfort during prolonged use. Separate on/off switch and speed control dial for the perfect speed every time. Lock-out collet button prevents engagement of spindle lock when tool is running. Cool-running ball bearing construction for smooth and quiet operation.