I'm using this K&M 25530 boom arm on a K&M 201A/2 Chrome tripod to hold a Rode NT1 mic. Very happy with the purchase. Never again will I struggle to stop the boom from sagging.
The boom can be extended to well over a meter, though the extension becomes a bit wobbly with a heavy mic at maximum extension.
An excellent choice if you either need to hold a medium weight mic (e.g. Shure SM58) at over a meter extension (keyboard players / drum overheads), or a heavier mic with a reasonable up to about a meter extension (guitar / vocal / anything else).