PET-U 1 Pair of Matched 2-4-6 Precision Parallel Blocks 23-Hole 0.0003 Inch Alloy Steel 246 Blocks

2-4-6 23-Hole Matched Precision Parallel Blocks 40Cr Steel Specification: Hole: 23 Size: 2 x 4 x 6 Material: 40Cr Steel Hardness: HRC 55-62 Parallelism: 0.0003 Squareness: 0.0003 /1 Tolerance of Size: ±0.0004 Thread Holes: 5 - (5/8 -11) Untapped Holes: 18 - (16mm) Features: With 5 threaded holes (5/8 -11) for bolting drilling hammering or other purposes This is a set of 246 parallel blocks containing two that you can use to assemble into other shapes The parallel blocks are packed in cartons with a layer of rust-proof wax paper which is easy to clean and has a good surface finish Precision machine block milling machine very suitable for machinists woodworking metal working work accurate and easy to clean Package Includes: 2 x 2-4-6 Precision Parallel Blocks Note: Do not store them in a humid environment even if you do not use them you should brush them regularly to prevent rust