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 438040 Plankton Net for quantitative collection with cowl Price on request 438015 Spare Net Part for Plankton Nets No. 438 010 and 4 Price on request 5065M-310 Surface Catch Net Price on request