it is a 6mm allen wrench. A ball type allen works best to get to the plug.
An allen wrench is sometimes referred to as a hex wrench or hex key.
To fasten and unfasten Allen screws and bolts. These fasteners have a hexagonal slot in the top into which the Allen wrench or key fits.
I believe it's 17 mm wrench, not Allen key.
You need 3/8 Allen key.
Not likely to be Allen key, try 15 mm regular wrench
I believe that is 7mm Allen key.
An Allen key is another name for a hex head wrench, a screwdriver with a handle and a hexagonal head at right angles.
It would be either a 15 mm wrench or a 7mm Allen key.
It's either 14 or 17 mm wrench , not Allen key.
The "Allen screw" name for the socket head cap screw and "Allen key" for the wrench originate from the products of the Allen Manufacturing Company of Hartford, Connecticut. According to Bates, it is widely reported that the company trademarked the name "Allen wrench or key" for its range of hex wrenches in 1943. The Allen wrench trademark of the Allen Manufacturing Company owas taken out in 1943, Allen became such a successful brand of hex key that many consumers in following decades have assumed (reasonably but incorrectly) that the internal-wrenching hexagon drive was invented by someone named Allen.
You need a 1/4 Allen key .