Open Socket Wrench

socket wrench
A ratchet tool with a series of detachable sockets for tightening and loosening nuts of different sizes
a wrench with a handle onto which sockets of different sizes can be fitted
A socket wrench, more commonly referred to as a ratchet, is a type of wrench, or tightening tool, that uses separate, removable sockets to fit many different sizes of fittings and fasteners, most commonly nuts and bolts.
a long-handled wrench with interchangeable heads that fit over nuts and bolts of various sizes and a ratchet that makes tightening nuts and bolts easier.

open
A championship or competition with no restrictions on who may qualify to compete
An accidental break in the conducting path for an electrical current
a clear or unobstructed space or expanse of land or water; "finally broke out of the forest into the open"
cause to open or to become open; "Mary opened the car door"
affording unobstructed entrance and exit; not shut or closed; "an open door"; "they left the door open"