3/8 Shank Boring Bars 34″ Boring Bar Set C6 12 Pcs Carbide Tipped Bars 34″ Shank Lathe Tool Carbide Tipped Boring Bars 1-13/32 x 2-21/32, & 1 ea. Boring Bars Have Ground Alloy Steel Shank 50 RC. Minimum Boring Range Boring Depth Range Storage Base Dim 3/4 - 2-1/4 9 Piece boring bar set features C-6 carbide for use in harder materials but also works great in aluminum and other soft metals , Shank Diameter- 3/8 Borite 9 Piece C6 Carbide Tipped Boring Bar Set, 3/8 Shank Diameter - A375| Penn Tool Co., Inc Boring Depth Range: 3/4 to 2-1/4 Minimum Boring Range: 5/16 - 7/16 Boring Bars have ground alloy steel Shank 50 RC. 9 PC Boring Bar Set. Minimum Boring Range: 5/16" - 7/16". Boring Depth Range: 3/4" - 2-1/4 All shanks are held to 0., 0000-0., 0005 from the nominal diameter and made of special heat treated alloy steel Shank Diameter- 3/8 Minimum Boring Range: 5/16 - 7/16 (see below) Overall Length: 2 to 3-1/2 (see below) Boring Depth Range: 3/4 to 2-1/4 (see below) Contains (3) pcs., 5/16 minimum bore (1 ea. 1-1/2 x 2-3/4) Contains (3) pcs., 3/8 minimum bore (1 ea. 3/4 bore depth x 2 overall, 1 ea.