เกลียวเพิ่มอาบสังกะสี Hot Dip Galvanized Conduit Enlargers

1/2" to 3/4", 1/2" to 1", 1/2" to 1-1/4", 1/2" to 1-1/2, 3/4" to 1", 3/4" to 1-1/4", 3/4" to 1-1/2", 1" to 1-1/4", 1" to 1-1/2", 1" to 2", 1-1/4" to 1-1/2", 1-1/4" to 2", 1-1/2" to 2", 2" to 2-1/2", 2" to 3", 2-1/2" to 3", 3" to 3-1/2", 3" to 4", 3-1/2" to 4"