Omega Products BT40 Face Mill Arbor - FMB32 Through Coolant - 25,000RPM - G2.5 - 160mm Gauge Length - Form AD/B + CoolBT40 Face Mill Arbors with Through Coolant are designed to securely hold face milling cutters in BT40 spindle machines while providing efficient coolant delivery. With a speed range of 15,000 to 25,000 RPM and a precision rating of G2. 5 G6. 3, these arbors offer excellent stability and accuracy during high speed machining operations. They feature built in coolant channels that allow coolant to flow directly to the cutting edge, ensuring effective