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Shinano Pneumatic 4" Disc Grinder SI-2501L/2501 Shinano devised total solution of pneumatic tools which are build in Japan for your reliability and durability. With Shinano pneumatics, you can now focused on the job at hand. Shinano's pneumatic tools is the smarter investment as it have fewer moving parts thus making it maintenance friendly, safer on operational, cheaper operational cost compared to electric tools which consumes higher energy when unstable current being used at variable speed. The Shinano SI-2501L/2501 are equipped with powerful pneumatic motor for heavy duty grinding. The L suffix on each model number means optionally equipped with safety lever. Be advised that, if you have a light air compressor of 50% duty cycle, your motor can perform safely but you may overheat your compressor. Hence, a 5 hp compressor with a 100% duty cycle is going to make more air than a 7.5 hp compressor that only has a 75% duty cycle. The Shinano SI-2501L/2501 features: Light weight 4" disc grinder with rotary throttle 40% lighter than SI-2500 Speed governor assures safety operation Compact and lightweight body with rotary throttle for easy operation Precise gear mechanism assures the highest power transfer, durability and reduced vibration 4 different kind of spindle attachment included on package (4" 15mm hole, 4" 16mm hole, disc nut 15mm hole and disc nut for 16mm hole)