Surface preparation discs are made of non-woven material impregnated with abrasive grains for blending, cleaning, finishing, and removal of paint and rust. The disc is two inches in diameter with a male R-Type (Roll Lock) threaded backer. Blends and smoothes coated abrasive scratch patterns. Easily removes welding or cutting discoloration on stainless steel. These discs are made with aluminum oxide grain and are designed for cleaning, blending and finishing stainless steel. Compact backing minimizes work piece scratches and allows for full use of disc material and softer/buffing-like finishing. Designed to exceed industrial standards, our Quick Change Surface Preparation Discs are recommended to be used with high-speed power tools such as die grinders and hand-held pneumatic grinders. All Pro-Graad products are made with quality materials, which exceed ANSI and EU standards. We are driven to deliver high-quality, high-performing products to the end user. This is why we stand behind our 100% Product Guarantee. If you are not satisfied with the product, simply return your purchase within 30 days, and we will replace or refund your order. Pro-Graad is a USA Company with US Based Customer Support.