Bullet_point: ['1-2-3 precision matched pair block set is heat treated and case hardened to HRC 55 to 60', '8 X 6 X 5 open end slotted angle plate has convenient clamping slots for mounting', 'It is made of high tensile cast iron properly seasoned against distortion and accurately machined to .002 per 6"', 'The plate is widely used for machining, layout and inspection', 'They are also hardened and precision ground on all 6 sides of each block']

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