Specifications: Name:Boring Head Set; Material:High Speed Steel; Colour:Orange; Graduations:0.001 inch, 0-50; Boring Bar Hole:1/2 inch (12 mm); Cross Hole Diameter:1/2 inch (12 mm); Maximum Offset:5/8 inch (16 mm); Thread:1-1/2-18 (7/16); Scope of Boring:0.39 inch-4.9 inch (10-125 mm); Head Size(optional):2 inch; Weight:2.3Kg. Features: -Made of high quality steel with great match of hardness and toughness, thus prolonging its service life. -The boring head offsets up to 5/8 inch (16 mm), dial is graduated in 0.001 inch (0-50 dial). -2 inch size bore head with R8 shank, 1-1/2-18 (7/16) boring head thread. -Suitable for For processing inner hole surfaces, boring, boring outer circle, boring end face, boring ladder hole, boring hole end face, cutting hole and outer ring groove, etc. Package Included: 1x 2 inch Boring Head; 1x R8 Handle; 4x Boring Bars; 3x Hex Wrenches; 1x Tool Box. (Only the above package content, other products are not included.)