About TRISENSE TRISENSE a company engaged in all kinds of hardware fittings, specified as Vise Jaw, valve, bearing and so on. The company was established in 1990, has a grade reputation all over the world. Each products has been strictly tested before the factory. 4 '' Vise that Work on Any Metal Vise. your working piece Flat or Round from the metal on your vise. They will not discolour or leave any marks on your working piece, with 8 impregnable look earth magnets per set, they will put on your metal vise. The specific useful Design you to turn them over for use on the box or constituted spin. warranted We take customer service seriously and want you to be 100 % felicitous with your shopping experience. Feel relieve to contact us if you have any questions or comments, we will our best to meet your needs.