Specification: Item Type: Brick Liner Runner Material: PPR Engineering Plastics Aperture size: 9 to 12 cm (3.5 to 4.7 inches) Qty:1 pair Color: Red Package Included:1 Pair Brick Liner Product Description: This is the new tool for builders and bricklayers, which provides the ultimate and simple way to manage a line of bricks. It provides a fast, easy and convenient way for bricklayers to run precise and allows you to work where other options such as corner blocks and line pins can't. which means there is no need to maintain perfect tension when setting the line. Features precise line slots in the outer jaw which means brick lines can easily be run in internal and external corners. Made from tough PPR material, it is durable with the strength required to withstand the conditions of a construction site.