A demolition hammer, comprising: a housing having a first wall and a second wall opposite the first wall, and a power cell disposed within the housing, the power cell having a front face, wherein the housing is reversible such that the housing can be used with the power cell in a first orientation in which the front face faces the first wall and a second orientation in which the front face faces the second wall, wherein the housing includes a third wall and a fourth wall opposite the third wall, further comprising a plurality of wear plates, wherein the plurality of wear plates includes a first wear plate adjacent the first wall, a second wear plate adjacent the second wall, a third wear plate adjacent the third wall, and a fourth wear plate adjacent the fourth wall, characterised in that the hammer further comprises: a pair of first pins configured to retain a tool within the power cell; a second pin configured to retain the pair of first pins within the power cell; a third pin configured to retain a bushing within the power cell; wherein the first wall and the second wall each include a pair of apertures (114, 116) configured to receive one of the first pins, and the third wall and the fourth wall each include a pair of apertures (120, 122) configured to receive the second pin and a pair of apertures (126, 128) configured to receive the third pin, wherein the apertures (114, 116) configured to receive one of the first pins are spaced equidistant from a first longitudinal axis, wherein the apertures (120, 122) configured to receive the second pin are spaced equidistant from a second longitudinal axis, and wherein the apertures (126, 128) configured to receive the third pin are spaced equidistant from the second longitudinal axis, each wear plate having a first pair of apertures (90, 92) configured to receive the first pin and receive the second pin, nonconcurrently, the wear plates being interchangeable with one another. a housing having a first wall and a second wall opposite the first wall, and a power cell disposed within the housing, the power cell having a front face, wherein the housing is reversible such that the housing can be used with the power cell in a first orientation in which the front face faces the first wall and a second orientation in which the front face faces the second wall, a pair of first pins configured to retain a tool within the power cell; a second pin configured to retain the pair of first pins within the power cell; a third pin configured to retain a bushing within the power cell; wherein the first wall and the second wall each include a pair of apertures (114, 116) configured to receive one of the first pins, and the third wall and the fourth wall each include a pair of apertures (120, 122) configured to receive the second pin and a pair of apertures (126, 128) configured to receive the third pin, wherein the apertures (114, 116) configured to receive one of the first pins are spaced equidistant from a first longitudinal axis, wherein the apertures (120, 122) configured to receive the second pin are spaced equidistant from a second longitudinal axis, and wherein the apertures (126, 128) configured to receive the third pin are spaced equidistant from the second longitudinal axis, each wear plate having a first pair of apertures (90, 92) configured to receive the first pin and receive the second pin, nonconcurrently, the wear plates being interchangeable with one another.