Groove Sharpeners have been around for quite some time but there are some unknowns as to how they work and why they work. In order to understand why they work a little insight into the steel components of clubheads needs to be addressed. A golf iron is made of either Stainless Steel (Cast irons) or Carbon Steel (Forged irons). The majority of “game improvement” irons are Cast and made of stainless steel. Casting is a process by which the stainless steel is heated into liquid form and poured into a mold….