Forget angle grinders. With the Spiider and Mongoose decorative concrete engraving tools, you can create free-form artistic cuts safely and easily. The Spiider combines track-free cutting with a swivel steering arm for maximum maneuverability and control. The Mongoose is ideal for straight cuts, arcs, and circles, and is easy to use while standing or kneeling. Both are on wheels and have a flip-up pointer, built-in vacuum port, depth-control screw, spring-loaded cutting head, and blade port. Engrave-A-Crete Inc.