United Poly Engineering [P] Ltd. Offers Plastic Made Kidney Trays. United Poly Engineering [P] Ltd. Has achieved ISO 9001:2000 certifications. United Poly Engineering [P] Ltd. Supplies stainless steel & plastic hospital hollowware & utensils and hospital furniture. Plastic Made Kidney Trays has been available in the length of 150mm. The width of Plastic Made Kidney Trays is 75mm. These kidney trays are also available in disposable paper meshe & plastic thermoforming. It is available in the model no. Of P-051.