All metal gear construction ensures high transmission durability Single sleeve keyless chuck enables easy bit installation/removal with one hand Ergonomically designed rubberized soft grip provides more control and comfort No load speed : Hi : 0-1,400 / Lo : 0-400 Capacity : Steel : 13mm (1/2");Wood : 36mm (1-7/16");Masonry : 13mm (1/2") Max. fastening torque : Hard / Soft : 42 / 24N?m Impacts per minute : Hi : 0-21,000 / Lo : 0-6,000 Standard Equipment : (+)(-) bit.