Mersen GPM panel mount fuse holders are in sizes to accommodate 5x20 mm, 1/4 x1-1/4 in, Class CC and midget (1-1/2 x 13/32 in) fuses. All 30 A holders have glass-filled polyester insulators for extra dependability and trouble-free installation. Patented design allows same body to accept screw or bayonet knob. Flange design allows front or rear mounting. The 10 A and 15 A holders are for front mounting only.