These are a pair of high quality Replacement for Evolution Electric Disc Cutters, R230DCT , R255DCT, R300DCT water suppressed R300DCT+, these are the perfect carbon size for the machine for both 110v and 240V. Evolution R230DCT 230mm 9" Electric Disc Cutter Concrete Saw Evolution R255DCT 255mm 10" Electric Disc Cutter Concrete Saw Evolution R300DCT 300mm 12" Electric Disc Cutter Concrete Saw Evolution R300DCT+ 300mm 12" Electric Disc Cutter Concrete Saw with Water Suppression These are HIGH Quality Carbon Brushes and made from HIGH grade Copper wire Springs. 100% Money Back Guarantee if your not happy, but my feedback and sales figures speak for themselves. BEWARE of sellers stating they are from the UK and supplying cheap inferior brushes and they are not even in the UK, if you.