A tray for serving beverages includes a first beverage support section, a second beverage support section, and a contoured arm rest member extending from the first beverage support section and the second beverage support section. The roller skate frame includes a plate being pressing molded into a main frame of the roller skate comprising two wheel-mounting plates corresponding to each other, and a front bottom connecting face and a shoe-mounting plate connecting thereto. The upper end and the lower end of each pole are connected to the locking joints. An electrical bonding clamp is carried by the housing on the outer surface thereof and is adapted to securely clamp an electrical bonding conductor in order to provide an electrical bond for the housing and for the ladder.