This is the GrimRacer 2mm CNC Machined Turn Fin for the AquaCraft UL-1 Superior FE Hydro RTR 2.4GHz (AQUB20**). FEATURES: Increases performance and handling for .12- .18 powered sport hydros. GrimRacer high performance turn fin and mounting bracket will help your boat turn faster with more stability in both right and left turns. It will also provide better straightaway handling. Aluminum Construction CNC Machined Easy to install Lightweight Stainless steel fasteners Adjustable INCLUDES: (1) Turn fin (1) Turn Fin Mounting Bracket (5) 3x8mm Washers (5) 3x10mm Cap Head Screws (3) 3mm Locknuts REQUIRES: Installation SPECS: Length: 108mm (4.25") Width: 44mm (1.73") Thickness: 1.65mm (0.06") cnh 12/16/08 ir/jxs