And here it is from Chris King's product description:

"For installation of the bottom bracket we offer the Chris King BB External Cup Tool. Our cup tool is anodized aluminum and features a 3-8" socket drive and recommend use with a high-quality torque wrench. The spline interface is precision made to match our bottom bracket cups ensuring a secure fit during installation while preventing finish damage."

It says it's made for their BB cups, but I'm sure it would still work better than the Park one I'm using. To be honest I'm not very impressed with Park tools in general. I bought one of their cassette lockring tools and the splines were so out of spec that it wouldn't fit into the lockring of my 6700 cassette. I exchanged it for another one and it worked fine. They seem to have poor quality control overall. I wish I had invested in this Chris King BB tool in the first place, but unfortunately I didn't know it existed.