Please browse below url to learn more about this compression spiral router bit: br (mobile only) br br (PC only) br br Tool type: spiral cut br Flute type: compression (up and down cut) br Debris removing way: compress br Flute quantity: two br Coating: without br Raw material: carbide br Origin: mainland of China br Application: for cnc router using, good for cutting MDF, PVC, laminated board br Package: each compression spiral router bit is individually packed in a separate plastic case br br All regular size includes: br 3.175mm shank (18 shank): 3.175x15mm, 3.175x17mm, 3.175x22mm br 4mm shank: 4x22mm br 5mm shank: 5x22mm br 6mm shank: 6x25mm, 6x22mm, br 8mm shank: 8x35mm, 8x42mm br 10mm shank: 10x35mm, 10x42mm br br All router bits, one-stop shopping br From www.eaglecnctec.com br Please inquiry, sales@eaglecnctec.