Description: With ultra precision feature, this clamping block makes your manufacturing and metalworking smoothly. As a hardware tool, this cushion block is an idea for the setting, layout and inspection of various machine tools and parallel horns for milling machines. Made of 40cr alloy steel material, it is durable and wear-resistant. Its length is 7.5cm, width is 5.0cm, height is 2.5cm. It is suitable for all kinds of machine tools, and it is used for setup, layout and inspection work. Item Name: Parallel Block Material:Alloy Steel Accuracy: 0.0002inch Hardness: 56-60 RC Number of Holes: Total 23 Holes Inside, 5 Holes(Trapped in 3/8-16 Threads for Clamping), 18 Ordinary Holes Size:7.5cmx5cmx2.5cm/2.95inx1.97inx0.98in Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 2 X Parallel Blocks