RST RTR12502 Brick Jointer 1/2 x 5/8 \" The RST RTR12502 brick jointer is designed to imprint grooves into recently filled mortar joints at the stage when they are starting to set in order to improve the lifespan and visual impact of the mortar. It is double ended for increased versatility and its hardened steel blade ensures maximum strength and durability. Features: Hardened carbon steel blade Convenient double ended design Gives a professional finish to joints between bricks For striking concave joints Specification: Size: 1/2 & 5/8 \" / 15 & 18 mm