15mm/19mm管径碳纤维导管 导轨碳纤管 相机配件跟焦器连接滑导轨
inches,且门和窗户的洞眼大小不能超过19mm*19mm
19mm / 0.7480315(inch) 10pieces chrome steel bearing ball di
u/t: ø35mm, d/t: ø35mm, s/s: ø19mm, c
an easy guide to button measurement and sizing
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