1. Versatile 4in1 Chassis Design This hand sanding block features a brushed chassis with four interchangeable styles, including concave, small arc, flat, and large arc surfaces. The fastening element enables quick sandpaper changes, making it ideal for tackling various sanding tasks. The ergonomic design ensures smooth operation on both flat surfaces and hardtoreach areas. 2. Adjustable Dust Extraction System Equipped with a rotary air inlet switch. This sanding block provides precise dust control during operation. The innovative design minimizes airborne particles and optimizes sanding performance. Simply rotate to adjust the suction power for different materials and working conditions. 3. Ergonomic Comfort Grip With an oversized grip and an elevated area, this sander exceptional comfort during prolonged use. The textured grip prevents slipping, while the balanced weight distribution reduces hand fatigue. It easily accommodates ringlongboard filing sandpaper for versatile applications. 4. Professional Grade Multitasker For detailed work on flat surfaces, tight corners, and complex contours, this tool delivers unmatched control. Whether performing fine sanding or paint preparation, it maintains consistent pressure across all surfaces. Designed for precision work in woodworking and metal fabrication projects for automobiles.