Turning indexable insert comes in combination with the Stellram Boring Bars give greater radial clearance, with the improved design of Insert and Boring Bar, allows for greater profiling capability and chip evacuation. With the 75° inclusive cutting angle this gives the E insert an advantage over the C style insert, allowing for greater radial clearance between the work piece and insert for profiling and chip evacuation. Also improves insert location with a more secure pocket design whilst not compromising insert edge strength.