Feature 1.This brush is made of stainless steel coarse wire and will not rust. 2.1/4" shank fits all electric cordless drills and grinders,4500 Max RPM 3.Versatile kit & Commonly used for: Rust removal, Paint removal, Deburring sharp edges, Edge Blending etc 4.Designed for easy access into narrow holes and confined areas. NOTE: 1. Remember to wear goggle or eye protection in case scrap are thrown from the brush as it spins. 2.You can test it on a small area first before applying it on a large area. 3.The dimensions are measured by hand and may have a little error. Please don't mind.