Optimize your metal grinding work with these 5 Makita Premium 4-1/2” Grinding Wheels for Cast Iron, Stainless Steel & Metal, at a 15-30-degree angle, to the work surface, applying the proper amount of pressure to allow the grinding wheel to do the work. For best results, consider not pushing too hard on the wheel, which can cause the grinder to stall or kick back or give a less efficient grinding action, while also increasing the chances of slippage or loss of control of the tool, resulting in injury or damage. Applying light to moderate pressure and consistent movement will provide the most efficient grind and minimize heat build-up. Consider using light pressure and a consistent motion throughout the grind for the fastest grind-rate and prolonged wheel life. Excessive pressure through the grind causes increased friction and heat build-up, which can cause increased heat discoloration of the work piece and reduced wheel life. For demanding applications, higher amperage &/or torque angle grinders provide easier, long-lasting & efficient grinds.