Each photo is a different side of block spun.
SPI ERON Japan Precision Ground Box Parallel 4" x 4" x 4" 96-071-6.
- Made of high quality fine grained cast iron, stress relieved.
- Made in Japan.
- All faces and ends finished square and parallel.
- Size tolerance ±.002".
- Ground square within .0005" per 4 inches and parallel within .00025" per 4 inches.