This is a Speed 400 6x3 Propeller and Adapter by Master Airscrew

FEATURES: Black plastic propeller Aluminum hub Dual set screw design For 3/32" motor and gearbox shafts

INCLUDES: One propeller One prop hub One prop screw One allen wrench One washer Three (4-40 x 1/8") set screws

REQUIRES: Motor or gearbox to attach this to.

SPECS: Hub Prop Length: 16 mm (5/8") Diameter: 14mm (9/16") 152mm (6") Inner Dia.: 2.3mm (3/32") Pitch: 76mm (3"