18MM MAGNETIC SCREW CAP BUTYL/PTFE 3MM 100PCS (100/pk)
https://www.manchesterbeacon.org/shop/rw2-1030-72021-18mm-magnetic-screw-cap-butyl-ptfe-3mm-100pcs-100-pk-313076
https://www.manchesterbeacon.org/web/image/product.template/313076/image_1920?unique=07fba14
This 18MM is guaranteed a 18MM with the use of BUTYL/PTFE and directly supplied to your lab by Gentaur's warehouse.
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30-day money-back guarantee
Shipping: 2-3 Business Days