BlueSpot L Shaped Corner Blocks Brick Laying Builders Brick String Line The Blue Spot Tools 2 PCE Brick Line Blocks are manufactured from hi-visibility durable ABS plastic. The heavy duty L shaped blocks are suitable for setting out when bricklaying. Can be easily adjusted for accurate and precise bricklaying. For use with brick line (not included). Manufactured from hi-visibility durable ABS plastic Can be easily adjusted for accurate and precise bricklaying For use with brick line (not included) The heavy duty L shaped blocks are suitable for setting out when bricklaying