These are of ductile castings and are used for grounding the anchor rods.
Part No.  Blade Diameter "D" (Inches)  Length "L" (Inches)  Square Hub Size "B" (Inches)  Thread "T"  Approx. Wt. (LBS/100 Pcs) 
PI 4050  8"  91/2"  13/8"  5/8"11 UNC  896 
PI 4051  8"  91/2"  13/8"  1"8 UNC  750 
PI 4052  10"  91/2"  13/8"  5/8"11 UNC  1038 
PI 4053  10"  91/2"  13/8"  1"8 UNC  940 
PI 4054  115/16"  91/2"  13/8"  5/8"11 UNC  1174 
PI 4055  115/16"  91/2"  13/8"  1"8 UNC  1023 
PI 4056  8"  91/2"  11/2"  1"8 UNC  817 
PI 4057  10"  91/2"  11/2"  1"8 UNC  1104 
PI 4058  115/16"  91/2"  11/2"  1"8 UNC  1250 
