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 & soft start. There is an anti-restart function for maximum user safety & 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.