New Dremel #531 Stainless Steel Brush A cup-shaped brush with stainless steel wire bristles. 1/2" wide shank 1/8" Ideal for cleaning, deburring and surface-finishing items made from stainless steel, aluminum, silver, pewter or other white metals. It is very effective flat surfaces - For best results, insert the accessory bit all the way into the tool and then back it out slightly before tightening down. This provides plenty of shank for the collet or chuck to hold onto. - Do not run in excess of 15,000 rpm. Therefore, do not use with a Single-Speed MultiPro Rotary Tool or a Heavy-Duty Flex-Shaft Tool unless you use the #221 Foot Speed Control. Keep a light touch, letting the tips of the brush do the work. Too much pressure can break the wire bristles. Before using on a material, allow the tool with brush to run at operating speed for at least one minute to discharge any loose wire bristles. Make sure no one stands in front of or in line with the brush.Do not use stainless steel brushes in areas where carbon steel particles may come in contact with the brush (such as steel workbenches). This prevents rust and contamination. For the same reason, always store stainless steel brushes apart from carbon steel brushes