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Type B: 1/2 and 3/4 steel; 1 to 6 malleable iron; zinc plated. Type HB: 1/2 and 3/4 steel; 1 to 6 malleable iron; mechanical/hot dip galvanized. Type AB: aluminum bushing. Type RB: bronze. Type SB/SBT: 1/2 and 3/4 steel; 1 to 6 malleable iron; zinc plated; stainless steel screws