Cooper Bussmann 0.25" 20A Glass Tube Inline Fuse Holder. It is designed for 1/4" diameter fuses and operates with a voltage rating of 32V and a current rating of 20A. Made from durable universal nylon, this fuse holder features a twist lock for secure installation. It does not include a fuse. Dimensions: 5.50"L x 2.75"W x 0.75"H.