Ruihan offers the best CAT40, CAT50 & R8 End Mill Holders manufactured to the highest quality standards in the industry. Our G2.5 X 30,000RPM certified balancing is our standard while others offer inferior product for a comparable price. We offer coolant through the spindle and flange capabilities AD+B on all End Mill Holders as standard where our competition does not. With our 0.0002” – 0.000” TIR, Runout hardened to 58-62HRC, made of High-Quality Chrome Alloy Steel, Taper Shank ground to AT3 or better and Bright Mirror finish you can count on our quality every time. Each holder comes with a certified inspection and Balancing certificate to ensure our customers confidence in our products. Overall, we offer the best products at the best price in the market.