Individual Hot Feed Fiber base. Nickel-plated phosphor-bronze plated fuse clips. Hard fiber insulator base with 11/64" (4.4mm) diameter mounting holes. Width: 2 1/4" (57.2mm), height 5/8" (15.9mm). Brass terminals and screws. Mounting holes .75" (19.0mm on centers. For SFE 20A or 3AG (AGC) fuses, and 30410 circuit breakers.