Matl high impact rigid acrylonitrile butadiene.Steren (abs) per mil-m-22544; type four; light yellow in colorper fed-std-595, number 13655; irregular in shape; 7.285 in.Approximate l; 5.2777 in.Approximate w nom; 0.220 0.160 in.Thk.Nom; 0.800 dia.Hole through