<ul><li>?HHIP 8 X 6 X 5 open end slotted angle plate has convenient clamping slots for mounting.</li><li>?The plate is widely used for machining, layout and inspection</li><li>?It is made of high tensile cast iron properly seasoned against distortion and accurately machined to .002 per 6"</li><li>?The plate is square and parallel on all faces and Slot A is 90? to slot C</li><li>?1-2-3 precision matched pair block set is heat treated and case hardened to HRC 55 to 60</li><li>?They are also hardened and precision ground on all 6 sides of each block.</li><li>?The 1-2-3 blocks accuracy with squareness on all sides within .0002" per inch.</li><li>?There are 23 holes consisting of 5 tapped holes that are 3/8"-16 for clamping and 18 untapped holes.</li><li>?These blocks have a cross drilling design gives minimum weight and maximum strength.</li></ul>