The bosch 1375a 4-1/2 in. angle grinder features a powerful 6.0 amp motor that produces 11,000 no-load rpm, making this compact grinder a powerhouse tool. it was designed for concrete contractors, vehicle fabricators and other professionals who need a compact grinder.. This bosch angle grinder actually comes with two tools in one. you’ll get a rotary hammer to go along with your 4