The Combination Spanner 27mm is a hand tool designed for tightening or loosening bolts and nuts. It features a 27mm size, making it ideal for working with fasteners of that specific width. The combination spanner has an open-end on one side and a ring-end (also known as a box-end) on the other, offering versatility. The open-end allows for quick application, while the ring-end provides a more secure, precise grip for higher torque applications. It's commonly used in automotive, mechanical, and general maintenance tasks, offering durability and reliability for both professional and DIY use.