CMT 806.690.41B SUPER-DUTY FLUSH TRIM BIT - XTREME SERIESCutting diameter: 3 4"; Cutting length 2; Overall length: 4 1 2": Shank size 1 2" ; Max speed: 18,000 RPM These XTREME flush trim bits guarantee the best possible finish along with extra long life thanks to one of a kind spiral technology. The compression, spiral design with 4 cutting edges produce a flush trim bit that has an upcut shearing cut on one half of the bit and a downcut shearing action on the other half. This design eliminating splintering