20MM HEADSPACE CAP BUTYL/PTFE 100PCS (100/pk)
https://www.knockoutrat.org/shop/rw2-1030-72503-20mm-headspace-cap-butyl-ptfe-100pcs-100-pk-313134
https://www.knockoutrat.org/web/image/product.template/313134/image_1920?unique=07fba14
This 20MM is guaranteed a 20MM with the use of 100PCS and directly supplied to your lab by Gentaur's warehouse.
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30-day money-back guarantee
Shipping: 2-3 Business Days