... C Bolt) A490 Tension Control Bolt(T. C Bolt) For Metric Thread can meet Class 8.8, 10.9, 12.9 ... from 1/4" to 3"Length : Metric size: 600 mm max.. Inch. size: 25" max.Grade: Metric size: 4.8,5.8,6.8,8 ... .8,10.9, A2,A4 Inch.size: Gr2, Gr5 ... -TB1.1/4 for English system, from TB12-TB30 for metric system.8-Our advantage: Good quality confirmed by you . ...