Package of 250 Base Plates, diameter 27.5mm Back Catalog number: 435035 Manufacturer: HYDRO-BIOS Availability: In the manufacturer's stock Price on request - + Recommended 438025-001 Repair Kit for Net Bucket No. 438 025, Price on request 435025 Combined Plate Chamber (Utermöhl-Chamber), set wit Price on request 438001 Surface Plankton Net acc. to Apstein Price on request