Shars 3" Adjustable Boring Head R8 Shank + 9pcs Carbide Tipped 3/4" Boring Bar Set New. A micrometer lead screw provides 0.001 direct reading accuracy and ease of adjusting. The main lead screw has between 10 to 15 graduations of backlash.
Double bar holder permits a greater boring range without an extreme offset condition. 1 division is equaled to 0.001 travel in diameter. 3/4 boring bar set 8 pcs.8PCS STFCR 90 Degree 3/4 Indexable Boring Bar Set. TCMT 21.51 EF YBG202 Carbide Insert. R8 Shank 1-1/2-18 Threads for Boring Head.