光(guang)滑限孔用(yong)量規，產品規格：各種(zhong)光(guang)滑塞規IT6級(ji)以(yi)上（含(han)6級(ji)）直(zhi)(zhi)徑1.6~320mm各種(zhong)光(guang)滑環規，對表圈：直(zhi)(zhi)徑φ8-400mm度(du)為±0.002。