1-2-3 11-Hole Matched Accuracy Parallel Blocks, 40Cr Steel

Specification:
Hole: 11
Size: 1" x 2" x 3"
Material: 40Cr Steel
Hardness: HRC55-60
Squareness: 0.0001"/1"
Tolerance of Size: ±0.0001"
Thread Holes: 5/16"-18
Untapped Holes: 12.7mm and 8.7mm
Features:
With 5 threaded holes (5/16"-18) for bolting, drilling, hammering or other purposes
This is a set of 123 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 123 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