Slotting knife, carpenter's bottom cleaning knife $ 8.54 Model: four blade t Black 12 * 1 / 2, four blade t Black 1 / 2 * 1 / 2 Ball head diameter (mm): 51 Cutting diameter (mm): 50.8 Maximum cutting depth: 12.7 Effective cutting edge number: 4 Function length (mm:) 12.7 Handle form: round Stem diameter (mm): 12.7 System: British system Useful length (mm): 12.7 Material: cemented carbide Type: end mill Number of slots: 4 1black: Four-blade T black 12*1/2 2black: Four-blade T black 1/2*1/2