Hi Jack,

There is no difference between the SureFit adapters found on tour and those in the consumer marketplace. The new SureFit adapters on 816 are referred to as Delta adapters which move in increments of 1 degree, and the triangle is the scientific sign for Delta. This was done to distinguish them from previous generation hybrid sleeves which move in .75 degree increments.

Hope this helps

That actually helps greatly, I never knew the difference. Thank you, Chris!