1 x 2 x 3 Matched Accuracy Parallel Blocks Set, 23-Hole 0.0001 Inch Alloy Steel, 123 Parallel Block Set with Screws and Hex Key

1" x 2" x 3" 23-Hole Matched Accuracy Parallel Blocks, 40Cr SteelSpecification:Hole: 23Size: 1" x 2" x 3"Material: 40Cr SteelHardness: HRC55-62Squareness: 0.0003"/1"Tolerance of Size: 0.0002"Thread Holes: 5 - (3/8 "-16)Untapped Holes: 18 - (9mm)Features: Used for installation, layout and inspection work.With 5 threaded holes (3/8"-16) 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.This product is equipped with nice tool box, easy to store and carry, not easy to mess or lost.Accuracy machine block milling machine, very suitable for machinists, woodworking, metal working work, accurate and easy to clean.Package Includes: 1 x Hex Key2 x 1" x 2" x 3" Accuracy Parallel Blocks5 x 3/8"-16 Stainless Steel Socket Head Cap Screws

• Material: Made of 40Cr steel, which is an alloy steel with good comprehensive mechanical properties and is currently one of the most widely used steels in the machinery manufacturing industry
• Dimensions and Accuracy: The three sides are 1, 2 and 3 respectively, the tolerance of size and flatness and parallelism is about 0.0001, the squareness is about 0.0003/1
• Holes: There are 23 holes in the block, 5 are threaded holes, which are used for clamping, the remaining 18 are untapped holes, 5 threaded holes are 3/8-16 in size, and the other 18 holes are 9mm in diameter
• Design: Accuracy grade tool steel was quenched and ground on all six sides of the block, cross drilling design for minimum weight and maximum strength
• Package Includes: 1Pcs hex key, 2pcs 1 x 2 x 3 parallel blocks, 5pcs 3/8-16 stainless steel socket head cap screws