Matl aluminum alloy per ams 4212 or ams 4280; 1.485 in. Min and 1.495 in. Max long; 1.855 in. Min and 1.857 in. Max od; bore 0.2495 in. Min and 0.2505 in. Max dia; counter bore 1.49 in. Min and 1.51 in. Max diameter by 0.31 in. Min and 0.33 in. Max deep each end