Made from high quality tool steel stress relief against distortion,precision ground and hardened +/-.0002inch in Parallelism; Paired +/-.0002inch in Height Set,10 Pairs,Thin Style; Each block is 6inch Long and 1/8inch Wide or Thick Easier Handling because there are 2 holes in each /8inch Incrementation in 1/8inch from 1/2inch to 1-5/8inch Each Set contains 1 Pair of the height listed:1/2,5/8,3/4,7/8,1,1-1/8,1-1/4,1-3/8,1-1/2 and 1-5/8, Weight: 5.21172787368 pounds, Manufacturer: LIXSAZSE