THL VHD250 Fiber Holder Bottom Insert, Ø177 µm Ø320 µm subcategory_copper patch panels bulkheads and fiber end faces bulkheads and fiber end faces assuring a return attenuation greater than 50dB for singlemode connections Accepted Diameter Side 2 Min Max Holes THL VHD080 No 57 µm 100 µm N A Yes THL VHD125 No 88 µm 161 µm N A Yes THL VHD160 No 112 µm 208 µm N A Yes THL VHF160 Yesb THL VHD250 No 177 µm 323 µm N A Yes THL VHF250 Yesb THL VHD400 No 279 µm 519 µm N A Yes THL VHF400 Yesb THL VHD500 No 346 µm 795 µm N A Yes THL VHF500 Yesb THL VHD750 No 516 µm 1047 µm N A Yes THL VHF750 Yesb THL VHE10 No 773 µm 1271 µm 1034 µm 1523 µm No THL VHE15 No 1280 µm 1769 µm 1534 µm 2007 µm No THL VHE20 No 1787 µm 2267 µm 2033 µm 2513 µm No THL VHE25 No 2270 µm 2844 µm N A No THL VHE30 No 2692 µm 3198 µm N A No