Specifications:

Bare Metal (4-inch)

4-inch plus box, one electricity and one charge (5 1.3A batteries)

4-inch plus box, two electricity and one charge (5 1.3A batteries)

Bare Metal (6-inch)

6-inch plus box, one electricity, one charge (5 1.3A batteries)

6-inch plus box, two electricity and one charge (5 1.3A batteries)