Lumberlok Krack Mate 3m Zinc Galvanised SKU: 229846 MODEL: KM Error. try again later You've successfully joined the club $ 7 .98 each Available on orders $50 to $1500.More info × Mitre 10 SAvailable at selected stores. Check your local store for details Variants A preformed metal crack inducer for all types of concrete surfaces. Features and benefits Eliminates concrete cutting. 36mm overall width, supplied in 3m lengths. Krack Mate is inserted into wet concrete after screeding stage, flush with surface level.