Grooved Forming Block Cube Metal Shaping Tool. This is a new grooved forming block. This forming block has six grooved sides offering a wide variety of unique grooves in many different sizes. Half-round, triangular, square and rectangular shapes provide great forming versatility. Machined from high-grade tool steel. This forming block measures approximately 3" x 2" x 2" (76.2 x 51 x 51 mm).