HHIP 1001-0107 3 Piece Boring Tool Set (3 Inch Head / R8-3/4 Inch)

R8 Boring Tool Set ~ Includes a 3" Head, an R8 Shank, and a 3/4" 9 Piece Boring Bar Set ~ The boring head bar holder moves freely and smoothly. ~ The boring head design assures superior rigidity for chatter-free boring and precise hole size accuracy. ~ The boring head has a hardened and ground adjusting screw designed for long lasting and trouble free use. ~ The tool capacity is up to 3/4". ~ The shank to the head is 1-1/2"-18. ~ A micrometer lead screw provides 0. 001" direct reading accuracy and makes adjusting easy. ~ 1 DIV = 0. 001 which means when turning the dial by 1 division/graduation, on the 0-100 dial, the boring head's travel is 0. 0005" in radius movement, 0. 001" in diameter movement.