50 * 50mm PTFE (Teflon) Back Catalog number: 8644T-50 Manufacturer: Sampling Systems Availability: In the manufacturer's stock Price on request - + Recommended 8700B-04 200mm Sieve. 850micron Price on request 8700S-03 200mm Sieve. 1mm Price on request 8700S-05 200mm Sieve. 700micron Price on request