●【PACKAGE】: A pack of 15 PCS 2 inch grinding wheels for die grinder. 1 Pack Mounting Mandrel with 3/8in and 1/4in Arbor. These are "depressed center" aka "type 27" grinding wheel. ●【EXTREME DURABILITY AND VALUE】: SI FANG 2 inch metal grinding wheels are made of high-performance alumina particles and high-quality resin-based abrasives for long service life and high material removal. Strong impact resistance and high grinding efficiency. The mounting mandrels is made of A3 carbon steel with a black plated finish for durability and rust resistance for long term use. ●【Two Different Types of Thread Heads】: The mounting mandrel of the die grinder is composed of a handle with two different types of thread head. This mounting arbor is mainly used to mount small diameter cut-off wheels or grinding wheels with a 3/8inch or 1/4inch core hole, with a journal length suitable for cutting discs from 0.035inch to 0.16inch thick. ●【APPLICATIONS】: This depressed center grinding wheels is specially designed to deliver superior performance on ferrous and non-ferrous metals. The 3inch grinding wheel grinding discs is perfect for cleaning, rust removal, grinding, stock removal, edge chamfering, beveling, weld belending, stripping resin. ●【COMPATIBILITY】: Mounting mandrel with 1/4 inch(6.35mm) shank fits most die grinders, drill rotary tools. Easy to install and remove, it really is the perfect must-have grinder accessory. Can be effectively used on metal for stainless steel, aluminum, copper, alloy steel, cast iron, galvanized parts and other metals, etc.