2-3-4 23-Hole Matched Accuracy Parallel Blocks, 40Cr Steel

Specification:
Hole: 23
Size: 2" x 3" x 4"
Material: 40Cr Steel
Hardness: HRC55-62
Parallelism: 0.0003"
Squareness: 0.0003"/1"
Tolerance of Size: ±0.0003"
Thread Holes: 5 - (3/8"-16)
Untapped Holes: 18 - (9mm)
Features:
With 5 threaded holes (3/8"-16) for bolting, drilling, hammering or other purposes
This is a set of 234 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
Accuracy machine block milling machine, very suitable for machinists, woodworking, metal working work, accurate and easy to clean
Package Includes:
2 x 2-3-4 Accuracy 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