Sioux has a great selection of inline and right angle grinders with collet sizes from 1/4 In. to 1/2 In. and 3 mm to 8 mm for a variety of applications. Speeds range up to 25,000 rpm to get the job done quickly and efficiently. Some models offer a choice of throttle control that is most convenient and comfortable for the operator. We also have extended models that fit into tight, hard to reach places.