1. Built-in water outlet hole, cooling directly to the tip of the knife to extend the life of the blade. 2. Increase the chip discharge groove design, improve the deep hole chip discharge function, link the press plate to make the cutter head and the cutter seat one, increase the cutting rigidity. 3. High and low section difference design, flat edge or high and low edge can be applied. 4. Positive and negative tooth screw adjustment mechanism, blade seat can be adjusted forward and backward. Name:Serrated double - edged rough boring head(RBH) Applicable tool holder:BT30/BT40 BT50 Tool holder interface:LBK1/2/3/4/5/6 Boring range:19-600mm RBH is a regular style Note:Due to different factory batches, the words of products are different, and the color and appearance of product accessories are slightly different, but it does not affect the normal use. Colour:As Shown Material:stainless steel Package Contents: 1 * RBH52-70-C Rough Boring Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.