Our technical parametres for parallel gauge as follows:1.Material:40Cr,spring steel2.parallelism:0.005mm3.hardness:HRC54°-59°4.Length:150/125mm5.Net.W:18.00kgs/14.50kgs,Gross.W:18.50/15.00kgs6.in packing:24pairs=48pcs7.Every piece will be stamped concrete size8:Concrete size(L*W*H) that is allogated as follows:48pcs(24pairs) 150*8*11(16 21 26 31 36)150*10*13(18 23 28 33 38)150*12*15(20 25 30 35 40)150*14*17(22 27 32 37 42)48pcs(24pairs)125*8*11(16 21 26 31 36)125*10*13(18 23 28 33 38)125*12*15(20 25 30 35 40)125*14*17(22 27 32 37 42)