"ALUMINUM ALLOY QQ-A-225/2 COMP 7075 COND T7351,ANODIZE MIL-A-8625 TY 1,3.987 IN. MIN TO 3.989 IN. MAX OD,3.264 IN. MIN TO 3.266 IN. MAX BORE THRU,COUNTER BORE 3.619 IN. MIN TO 3.621 IN. MAX DIA 0.650 IN. MIN TO 0.655 IN. MAX DP,1 EXTERNAL GROOVE 0.424 IN. MIN TO 0.434 IN. MAX W 0.368IN. DP,MACHINED SURFACES 63.0 AND 125.0 MICROINCH FINISH"