Features 1、Kit Contents: Our boring head and bar kit comes with 1 boring head, 12 boring bars, 3 hex wrenches and 1 storage box. 2、Cemented Carbide Boring Bars: The carbide boring bars in our R8 shaft boring head and bar kit are high strength, stable, wear resistant and durable. 3、Storage Box: The boring head bar kit is placed in a storage box as a whole, which is very convenient to store and carry, reducing loss. 4、High Accuracy: Micrometer guide screw in the boring head bar kit provides 0.0001in direct reading accuracy and easy adjustment. 5、Wide Range of Application: The boring head bar kit is suitable for CNC hardening and grinding on R8 shank machines. Specification Item Type: Boring Bar Set Material: Cemented Carbide Boring Head Specification: 3in Minimum Scale: 0.0005in Boring Bar Bore Diameter: 3/4in Cross Bore Diameter: 3/4in Maximum Offset: 1in Thread Size: 1-1/2in-18 R8 Shank can be mounted on a 2in, 3in or 4in boring head with a 1.5in-18 thread size Features. Designed so that the same bar can drill flat bottom holes or faces Alloy steel shanks are hardened and ground Carbide for steel and alloy steel Overall Length Bore Depth Miniature Bore 3-1/8in 1-1/8in 7/16in 3-11/16in 1-11/16in 7/16in 4-1/4in 2-1/4in 7/16in 3-1/2in 1-1/2in 9/16in 4-1/4in 2-1/4in 9/16in 5in 3in 9/16in 3-7/8in 1-7/8in 11/16in 4-13/16in 2-13/16in 11/16in 5-3/4in 3-3/4in 11/16in 4-1/4in 2-1/4in 13/16in 5-3/8in 3-3/8in 13/16in 6-1/2in 4-1/2in 13/16in Package List 1 x Boring Head 12 x Boring Bar 3 x Hex Wrench 1 x Storage Box