BUSSMANN BK-HTB-46I-R (HTB-46I) Cartridge Fuse Holder. High Profile Rear Hex Nut. For 6x30mm (1/4 in x 1-1/4 in) Fuses. In-Line Panel Mount BUSSMANN BK-HTB-46I-R Cartridge Fuse Holder For 6x30mm (1/4 in x 1-1/4 in) Fuses In-Line Panel Mount. Quick Connect. High Profile Rear Hex Nut