High Precision CAT 50 Jacobs Taper Adaptor, Taper to Bore Runout <0.0002" Balanced G2.5 x 30,000 RPM, Made out of High Quality Chromium steel, H5 Bore Tolerance, Coolant through Capabilities, Taper Shank Ground to AT3 Accuracy ( Or Better), CAT40 DRAW BAR THREADS 1"-8, 100% inspection quality control in the USA. Mirror Bright Finish Shop's Choice VETERAN OWNED........??HIGHEST ACCURACY: Taper to Bore Runout < 0.0002" T.I.R.??HIGHEST TOLERANCE: H5 or Better Bore Tolerance.??COOLANT CAPABILITIES: Through Spindle Coolant??HIGH QUALITY STEEL: Made of High Quality Chromium STEEL..??PRECISION BALANCED: G2.5 X 30,000 RPM CERTIFIED..High Quality Chromium SteelChinaManufacturer100% Guarantee to be Free from any Manufacturing Defects. 100% Customer Satisfaction Guarantee