Flexible shaft design enables easy and self-centering during use.Controlled spring action and extended control limiter support smooth transitions between cylinders.Constructed from metal for and wear resistance.Protective sleeve facilitates insertion into engine cylinders and shields honing stones when not in use.Compatible with cylinder diameters ranging from 51 mm to 177 mm.Knurled nuts allow tension adjustment.Suitable for use in cars, trucks, buses, tractors, industrial engines, and small air-cooled engines.Dimensions: 42.8 x 12.2 x 4 cm (16.85 x 4.8 x 1.57 inches) and 43 x 12.2 x 4 cm (16.93 x 4.8 x 1.57 inches).Package includes 1 engine cylinder hone tool.