This is the GrimRacer 40x53 Metal Boat Propeller from AquaCraft.

PRODUCT ATTRIBUTES: Constructed of high quality Copper-Beryllium-Titanium material that
            is rigid but not brittle and can be sanded and shaped with less
            effort than stainless steel props
          Copper-Beryllium-Titanium material stays sharper longer and is less
            prone to dulling and chipping
          True center bore hub with raised letters and numbering for easy
            identification
          Tumbled to remove any excess cast flashing

WHAT'S INCLUDED: GrimRacer SuperVee 27 Nitro 40x53 Two Blade Metal Boat Propeller

WHAT'S REQUIRED: Installing on propeller shaft

PRODUCT SPECIFICATIONS:    Diameter: 40mm
          Pitch:    53mm
          Bore:    3/16"

ADDITIONAL INFO: Equivalent to the Octura 440 and the Prather 215 props (not carried)

          CAUTION: Wear eye protection when tuning and working on metal
            boat propellers.
          Wear a respirator when filing or sanding these propellers. The dust
            produced is hazardous to your respiratory health.

                                                                    
                                                                         
– For further information, please use these AquaCraft resources –
Click Here: Manufacturer's Product Web Page
E-mail: boatsupport@hobbico.com
Web Site: http://www.aquacraftmodels.com/
Phone: 217-398-8970
 
Postal Address:
AquaCraft
3002 N. APOLLO DRIVE, SUITE #1
CHAMPAIGN, IL 61822