This is a simple in-line fuse holder with 12 awg wire leads and takes standard glass AGC or MDL fuses up to 30 Amps. Because of its heavy duty construction it is especially suitable for the larger fuses. MDL and AGC fuses are available in a particularly wide range of increments and configurations (for example 0.25 Amps or slow-blow) making them suitable for specialized items. At PKYS we carry a wide range of fuses and although all the glass fuses are not listed on the website we do have almost all of them in stock so you have to ask.