A contact including a first connectable part, a second connectable part, and a middle part. The first connectable part includes a tube or plate. The plate has a cross section generally of U-shape, V-shape, C-shape, or L-shape. The tube or the plate includes a base and a first wall. The first wall extends from a first end portion of the base. The middle part includes a base and a first sloped portion. The base of the middle part is contiguously connected between the base of the first connectable part and the second connectable part. The first sloped portion is contiguously connected between the first wall and a first end portion of the second connectable part. The first sloped portion extends from a first end portion of the base of the middle part such that the first sloped portion slopes down toward the first end portion of the second connectable part.