W1—螺丝、箍头、钢带全部为铁镀锌(Screw,Housing and Band are all Zinc Plated.)
W2一螺丝为铁镀锌,箍头和钢带为不锈钢(Screw is Zinc Plated .Housing and Band are all Stainless Steel.)
W4一螺丝、箍头、钢带全部为不锈钢(Screw,Housing and Band are all Stainless Steel)
W1—螺丝、箍头、钢带全部为铁镀锌(Screw,Housing and Band are all Zinc Plated.)
W2一螺丝为铁镀锌,箍头和钢带为不锈钢(Screw is Zinc Plated.Housing and Band are all Stainless Steel.)
W4—螺丝、箍头、钢带全部为不锈钢(Screw,Housing and Band are all Stainless Steel.)