Inside Diameter Measuring

Heavy gauge two-piece housing has rust proof plated finish. Housing is crimped together at bolt holes. Bearing insert with 2 set screws has longer inner race for added load support. Extra thick non-conductive rubber liner corrects misalignment up to 2 degrees while reducing noise & vibration.

For twist drills with 118° angle, to check if the center of tip is concentric with the drill body. Made of stainless steel.