3'' Boring Head R8 Shank With 12 Carbide Boring Bars Case Dimension: 10 in L x 13 in W x 3-1/8 in H *Rough Estimation* Head size: 3" Boring Bar Hole: 3/4" Cross Hole Diameter: 3/4" Maximum Offset: 1" Thread: 1.5"-18 Graduations: 0.001 Shank Diameter: 3/4" Thread Size: 1.5"-18 Overall Boring Bars Length: 3''; 3-1/2''; 3-5/8''; 3-7/8''; 4-1/4''; 4-1/4''; 4-1/4''; 4-3/4''; 4-7/8''; 5-3/8''; 5-3/4''; 6-1/2'' C-6 Carbide Tipped Boring Bars Have Ground Alloy Steel Shank 50 RC Case Included Qty: 1 Light Item