General description Engis ability to engineer and manufacture custom bore finishing tools are the keys to success in demand honing and finishing applications. Engis Corporation has over 60 years experience and a long history in the processing of diamond particles. This experience is instrumental in the proper selection of the abrasives used in our bore finishing tooling. Engis also has its own machine and plating shops that ensures complete control of the ISO 9002 certified manufacturing process from beginning to end.