AGC. The external size is constant with AGC for all the different amperage ratings. 1/4 x1 1/4"
The SFE will vary in length with the amperage. They are 1/4" in diameter and IIRC, a SFE 20 amp will be the same size as an AGC 20, but a 30 amp will be longer than a 30 amp AGC.
Short answer is AGC Automotive Glass Fuse.