The Makita GA4540C 115mm Angle Grinder has the Makita "Super Joint System II" developed for effective vibration absorption as well as an electronic current limiter, speed control and soft start. There is an anti-restart function for maximum user safety and variable speed control dial for material specific working. The "Super Joint System II" provides increased machine durability by absorbing the vibration produced by the grinding wheel or cutting material. There is an ergonomically shaped barrel grip, with a perfect circumference size that fits the hand for extra comfortable handling.