Great value and performance. This is a new series of LOBSTER brand at this price. Excellent sharpness and cost performance. Uses: For cutting concrete products, blocks, straight, brick, tiles, etc. [Caution and Conditions] Please make sure to install the protective cover (wheel guard) set by the machine manufacturer. Do not use zigzag cutting, curved fog, or diagonal cutting without guides, cramps, or side use on the cutting wheels. Do not touch the hole while rotating with your hands or body.