9 Pair 1/4 x 6 Machinist Parallel Block Tool Set, 0.0002 Parallelism 3/4 to 1-3/4 Alloy Steel Accuracy Matched Parallel Bar

9 Pair 1/4" x 6" x (3/4" to 1-3/4") Matched Machinist Parallel Block Tool SetSpecification:Material: 40Cr SteelHardness: HRC52-58Parallelism: 0.0002"Tolerance of Size: ±0.0003"Features:The parallel blocks are packed in box with a layer of rust-proof wax paper, which is easy to clean and has a good surface finishAccuracy machine block milling machine, very suitable for machinists, woodworking, metal working work, accurate and easy to cleanPackage Includes:2Pcs 1/4" x 6" x 3/4" (5/16" hole)2Pcs 1/4" x 6" x 7/8" (5/16" hole)2Pcs 1/4" x 6" x 1" (5/16" hole)2Pcs 1/4" x 6" x 1-1/8" (3/8" hole)2Pcs 1/4" x 6" x 1-1/4" (3/8" hole)2Pcs 1/4" x 6" x 1-3/8" (7/16" hole)2Pcs 1/4" x 6" x 1-1/2" (7/16" hole)2Pcs 1/4" x 6" x 1-5/8" (1/2" hole)2Pcs 1/4" x 6" x 1-3/4" (1/2" hole)

• 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: All parallel blocks are 6 long and 1/4 thick, and they are 3/4, 7/8, 1, 1-1/8, 1-1/4, 1-3/8, 1-1/2, 1-5/8, and 1-3/4 wide
• Accuracy: The size tolerance is around 0.0003, and the parallelism tolerance is 0.0002
• Hole: Each pair of parallel blocks has two holes, and the size of the holes in each pair of parallel blocks is the same. 9 Pairs of parallel blocks have different sizes of holes: 5/16, 3/8, 7/16, 1/2
• Package Includes: 18Pcs parallel blocks, each size has two (a total of 9 sizes), the product in a box is easy to carry, not easy to knock