I got these one just a week ago, very good.. and cheap... lots of money saved. Did fitt my BlackJack Solderwerks BK6000 (Aoye OEM ?)perfect..
The heads/plates have a mounting "tube" where they are attaced with a screw, simple- but it Works ok.
9 blowheads for 12 USDollar..
http://www.ebay.com/itm/Hot-Air-Gun-Soldering-Rework-Station-Nozzles-1-Set-Hakko-Aoyue-Atten-ZK105-/261303931969Nozzles are compatible with Hakko, Kada, ATTEN and Xytronic, Aoyue 906, 968, 850, 6028, and many other systems
Direct replacement for Hakko Hot Air Rework Nozzles
All nozzles fit to 850/850A+ SMD Hot Air Rework Station.
Package :
9 blow head Sizes :
11.5 x 11.5mm
10 x 10mm
11 x 9mm
9 x 9mm
8.5 x 8.5mm
8.5 x 5.5mm
9.9 x 9.9mm
7.7 x 11.3mm
7 x 7mm
1 mounting (Inside Fitting diameter of 22mm.)