[Faster Conduit Layout] Works to reduces layout time compared to traditional tape measure methods. It allows quick and precise placement of center knockout marks. 2 items in package. [No Calculation Required] Pre-marked with multiple conduit spacing scales and measurement references that are clearly labeled. Makes it easy to measure, and mark multiple knockout positions with consistent precision. [Easy&Practical Operation] Put the side of the tool against the edge to simply operate, the conduit spacer accommodates common conduit knockout sizes from 1/2'' to 4''. [High Quality Material] Made of durable metal, endures harsh environments, resists corrosion and warping during operation, while maintaining its accuracy. The precision laser-etched markings on the body won't fade over time. [Good After-sale Service] Our product has undergone rigorous quality testing, but if you receive any damaged items, please contact us immediately and we will replace them for you. Feel free to ask us any questions.