0-3MM Pro-Series Centering Indicator ~ Length is 6-7/8″. ~ Shank diameter is 3/8″. ~ Feeler diameter is 1/8″. ~ Locating accuracy is within .0002″ of true center. ~ Operating speed not to exceed 800 RPM. ~ Capacity is 5/32″-12″ internally and up to 12″ externally. ~ Supplied in a fitted case. ~ Kit Includes a 3 ID feelers that are 2, 3 & 4″ long and 3 OD feelers that are 2, 3, & 4″ long. ~ Also includes is a center locating feeler. ~ Provides a simplified method of centering a workpiece or fixture on horizontal or vertical machines, internal or external diameters. ~ Face of indicator remains stationary in any desired position while the machine spindle rotates, leaving the operator with both hands free to accurately position the machine table. Length is 6-7/8″. Shank diameter is 3/8″. Feeler diameter is 1/8″. Locating accuracy is within .0002″ of true center. Operating speed not to exceed 800 RPM.