The Metabo 4-1/2" Cordless Angle Grinder, No. W18LTX, is part of Metabo’s PowerMasterSeries of 18V lithium-ion cordless power tools. Safety features include advanced motor protection with a no-volt release switch that protects against unintentional starts when inserting a battery, a burst-proof guard that can be adjusted in seconds without tools, and an electronic shut off that helps to prevent kick-back. Added features include thermal overload protection and an electronic soft start that helps extend motor life. Metabo’s proven air-cooled charging technology cools the battery pack to a level temperature during charging using guided air flow ducting. The W18LTX has a no-load speed of 8,000 rpm.