The 4-1.2 in Disc Grinder - G12SR4 makes improvements on previous models with smaller grip diameter which contributes to easier control and less fatigue with continuous use, increased performance with a higher power input of 6.2 amp and higher overload durability. The powerful 6.2 amp motor delivers great performance on tough jobs. The new motor design creates better cooling efficiency and ensures high motor durability. The G12SR4 also has a spindle lock for easy wheel changes and includes five grinding disc. This tool is ready to work out of the box.