http://www.cheyore.com/boring-tool/boring-head/ boring head Specification ModelBoring RangeCLLBK No.InsertScrewWrench(N.m)TorqueKGS Min.Max. RBA25-33-C25332445LBK2CCMT060204M2.5-6.0-3.5-60T81.20.23 RBA32-42-T32423155LBK3TCMT110204M2.5-6.0-3.5-60T81.20.36 RBA32-42-C32423155LBK3CCMT060204M2.5-6.0-3.5-60T81.20.38 RBA40-55-T40553965LBK4TCMT16T304M4-10-5.0-43T153.00.66 RBA40-55-C40553965LBK4CCMT09T304M4-10-5.7-60T153.00.66 RBA52-70-T52705075LBK5TCMT16T304M4-10-5.0-43T153.00.40 RBA52-70-C52705075LBK5CCMT09T304M4-10-5.7-60T153.00.40 RBA68-92-T68926485LBK6TCMT16T304M4-10-5.0-43T153.02.00 RBA68-92-C68926485LBK6CCMT120408M5-11-7.0-55T205.02.10 RBA90-122-T9012280100LBK6TCMT220408M5-11-7.0-55T205.03.03 RBA90-122-C9012280100LBK6CCMT120408M5-11-7.0-55T205.03.18 RBA120-164-T12016410095BSTTCMT220408M5-11-7.0-55T205.04.20 RBA120-164-C12016410095BSTCCMT120408M5-11-7.0-55T205.03.80 RBA160-204-T16020413095BSTTCMT220408M5-11-7.0-55T205.05.36 RBA160-204-C16020413095BSTCCMT120408M5-11-7.0-55T205.05.36 Product Name: RBH RBA Twin bit rough boring head Model: RBH25 RBH32 RBH52 RBH68 RBH90 RBH120 RBH160 Boring range: 25-204mm LBK No.: LBK2 LBK3 LBK4 LBK5 LBK6 BST MOQ: 1PCS OEM/ODM: Support Delivery: 7-35days Inspection: 100% inspection before shipping to ensure the quality Feature: 1. The head is suitable for single bit boring, twin bit boring and step boring with working diameter from 25mm to 500mm on diameter. 2. Umposed on both cartridges coubteracts producing highest rigitly and cutting, most suitable for a variety of boring 3. Boring head can be easily adjusted to different boring needs for matching on demand, boring depth can be extened by tool connectionboring head website:http://www.cheyore.com/boring-tool/boring-head/