I used this bad boy in my SDS Plus when demonstrating 1300 sq. foot tiles in my house. I started out by renting a professional thinning and tiling knife from a large orange crate store and after tightening the screws three times in an hour decided to buy it for next day delivery. This little guy saved me a lot of time by removing the superfluous stuff. The screws didn't come loose at all but continued to push through the thin layer and scratched the old rolled vinyl floor. I was impressed with how well it removed a thin layer without scratching the concrete slab floor. Worth every penny!