A shell having a first shell portion and a second shell portion. A first and second claiming surface may be disposed at an end of the first and second shell portions respectively. The first arm and the first shell portion may include a first outer surface. The first arm may include a first arm non-extended position. The first arm may extend away from the first shell portion when in a first arm extended position. The second arm may extend away from the second shell portion when in a second arm extended position. The first shell portion may be disposed to the second shell portion such that the first clamping surface and the second claiming surface separate in response to an external force applied to the first arm in the first arm extended position and the second arm in the second arm extended position.