Full Perforated Trays are used for delicate Micro Instruments and parts washing, sterilization and storage. Manufacture in stainless steel grade AISI-304. Electro Polished. Top and lid frame rod diameter 3.5 mm and 4.0 mm. Full wall perforation to protect sharp instruments edges and tips from damage. The perforation hole size is 2.0mm Smooth round edges. Sheet locking clip. Hinged Lids.