The pair of blocks is are heat treated and case hardened to HRC 57-62, fit for mounting work for precision. Features: Heat treated and case hardened to HRC 57-62. Made of precision-grade tool steel hardened and ground on all 6 sides of block. 23 holes includes (5) 3/8-16 threaded holes for clamping and (18) untapped holes. Cross drilling design allows for efficient use of lower weight with maximum strength. Suitable for all kinds of machine tool, used for set-up, layout and inspection jobs. Specifications: Material: Hardened Ground Steel Accuracy: 0.0001, 0.0002, 0.0003 (optional) Package Weight: 950g / 33.51ounces Package Size: 75 * 50 * 50mm / 2.95 * 1.97 * 1.97in Packing List: 2 * Blocks
