48P Optional Steel Pinion Gear for 5mm shaft

CNC Steel Gear then Nitride to increased wear resistance, 
improved fatigue life, and enhanced corrosion resistant Black
Black Steel base construction with 4mm set screw
Longer Base surface for maximum contact

One pinion gear 
One set screw 4x4mm
One 5mm to 1/8 conversion Sleeve

2mm hex wrench to install the set screw