May 15 2015 Press It’s All About the Groove It’s often said “It’s not what you know, but who you know”. But this is not the case in the sealing screw industry. More and more, manufacturers of sophisticated equipment large and small (and we mean large and small makers and large and small products!) are coming to ZaGO because of what we know. For our unmatched expertise in manufacturing the best, most effective sealing screws available. And it all begins with the groove.