Smaller backlash allows the operator to be able to dial in on the desired travel much faster. The other generic models which has 10 graduation in backlash, it's not easy to adjust the travel.Each Shars brand boring head is manufactured by an. 1 division is equaled to 0.001" travel in radius0.002" travel in diameter. Internal bore within H7 specification to give tight fitting with cutting's shank. Nickel plate finished have a great advantage over black oxided finish. Backlash comparison table among different vendor's boring head. Bar holder moves freely and smoothly. Design assures superior rigidity for chatter-free boring and precise hole size accuracy. Hardened and ground adjusting screw designed for long lasting and trouble free use. Each boring head comes with Inspection report. Round shanks allow the operator to set positive or negative rake. Chip breaker eliminates long stringer chips. A new cutting edge may be presented by simply indexing the insert. It is not necessary to remove tool from chuck or tool post. C6 grade: carbide for steel and alloy steel. The item "2 Boring head + 3/4 Straight Shank + 4pcs 1/2 Indexable Boring Bar Set A" is in sale since Thursday, January 7, 2021. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Toolholding\Other Toolholding". The seller is "discount_machine" and is located in Saint Charles, Illinois. This item can be shipped worldwide.