Profile: Stevens Engineering, Inc. designs and manufactures workholding accessories for horizontal and vertical machining centers. Our product line includes subplates, tombstones, vises and related accessories. Over 300 shapes and sizes of subplates are available to fit virtually any make or model of milling machine. The features of our 4-sided columns include steel construction, steel construction, all holes blind, eliminating entry of coolant & chips into interior, fully stress relieved for long-term dimensional stability and flatness .0003/12″.