Description Grooving Boring Bar 16MM (MGIVL/R) INSERT SIZE : 2MM (MGMN 200) 3MM(MGMN300) 4MM(MGMN400) LHS/RHS Material: MGIVL/R grooving bars are made from materials like 40-42CrMo  Hardness: MGIVL/R grooving bars can have a hardness of HRC42-46  Accessories: MGIVL/R grooving bars can come with accessories like a screw, wrench, spring, clamp, and shim  Inserts: MGIVL/R grooving bars can be used with inserts like MGMN