1.Versatile Chassis Designs: This hand sanding block comes with four types of chassis—concave, small arc, flat, and large arc—allowing for precise sanding on various surfaces. The hook and loop fastener system enables quick and easy sandpaper changes 2.Adjustable Air Intake Switch: Featuring an adjustable air intake switch with a rotary adjustment, this dust extraction sanding block allows users to control the suction power easily. This feature ensures efficient dust removal during sanding 3.Grip Design: Designed with ergonomics in mind, this sanding block has a larger s area on its handle, providing a comfortable grip even during extended use. The ergonomic design reduces hand fatigue, ensuring a more pleasant sanding experience 4.Multifunctional Usage: Ideal for both flat surfaces and hard-to-reach areas, this multifunctional sanding block even control when working on tight corners, contours, and other challenging spots