This attachment is a lifesaver! Industrial and Scientific grade, it has proven to be incredibly durable and efficient in sanding down drywall. Through trial and error, I found that it works best at around 1750 RPMs. The retractable feature is also a huge plus, making it easy to store away when not in use. The only con is that it can be a bit noisy during use, but the results are well worth it. Overall, highly recommend for anyone in the construction or renovation industry.