26．滑轮的外壳材质注意事项：
答：窗轮事业部的滑轮外壳材质有以下几种：碳钢，铝合金，201,304；其中铝合金外壳系列是可以选择做高度、宽度非标标准单价按价目表说明计算，其余材质做外壳非标都必须（在坚朗云采的非标报价查价，若非标报价查找不到的，则走询价（任何材质铣槽均需要询价）。下单时，滑轮的材质建议不要填或填标准，如有询价做非标材质外壳，按询价单填。
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