Using this industrial-grade grinder our manufacturing team found that it exceeded expectations. The 12000RPM speed made quick work of any grinding task, and the S1M KY33A 115 model was durable and easy to use .The ADJUSTABLE handle made for comfortable operation, and it was compact enough to fit in tight spaces. However, the noise level was quite high and required protective gear when used for long periods. Overall, a great tool for any industrial and scientific operation..