Single Expansion Shields – Zinc
1 / 4 " 4EP
3 / 8 " 4ER
Shank Width = Diameter
5 / 16 " 4EQ
1 / 2 " 4ES
Double Expansion Shields – Zinc
1 / 4 "
3 / 8 "
4JP
4JR
Shank Width = Diameter
5 / 16 "
4JQ
1 / 2 "
4JS
5 / 8 "
3 / 4 "
4JN
4JO
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