Eco Brazing Diamond Grinding Discs are intended for use in hazardous environments where errant sparks are not permitted, including nuclear plants and oil and gas industries. The manufacturer claims the discs reduce sparking to 1% of that produced by traditional resinoid grinding discs. The discs are suited for grinding steel, stainless steel and other materials. Available in grits from 30 to 80 on disc sizes of 4 in., 41⁄2 in., 5 in. and 7 in. CS Unitec; 800-700-5919; www.csunitec.com