It is a fast-acting 5*20mm 250V 5A Glass Tube Fuse (Pack of 10).
Fast-acting, low breaking capacity
Optional axial leads available
5 x 20mm physical size
Glass tube, silver-plated (63mA-315mA) and nickel-plated (500mA-15A) brass endcap construction
Designed to UL/CSA 248-14
10 x 5*20mm 250V 5A Glass Tube Fuse