For 1/4" x 1 1/4" and 5 x 20mm fuses All holder bodies have the option of using 1/4" x 1 1/4" or 5 x 20mm carriers Withstands 15 to 20 Lb-In torque to mounting nut when mounting fuse holder to panel High temperature, flame retardant, Thermoplastic meets UL 94V0