AquaCraft Drive Dog   AQUB7885    Drive dog with prop nut for 3/16 shaft. Very small 8mm OD.  $7.99ea
 

Kintec Racing 3/16 Stainless Steel Small Dog   Made for a 3/16 shaft with an outside diameter of 5/16.
These are the highest quality small dog on the market and stainless steel.  $3.25

Octura 3/16 Small Dog  These are for a 3/16 shaft and have a 5/16 outside diameter.  $3.00 ea

Prather Stainless 3/16 Double screw  This high end unit has 2 set screws for perfect balance. Fits 3/16 shaft with an outside diameter of 7/16. Made from stainless steel. Made in USA  $5.00 ea

3/16 Stainless Tapered   These stainless steel dogs fit a 3/16 shaft and have an outside diameter of 10mm that tapers down to an 8mm (5/16) diameter. This design gives more threads on the setscrew for better holding and makes a smooth transition to the prop. $3.75

4mm Stainless Made to fit a 4mm shaft. Has an outside diameter of 8mm.

3/16 Stainless  Fits 3/16 shaft and has an outside diameter of .390 (10mm).    $3.00 ea

Spartan Drive Dog  Stock brass replacement drive dog. Fits 3/16 shaft and has an od of .390   $2.90

1/4 Stainless  Fits 1/4 shaft and has an outside diameter of .470 (12mm).   $4.00 ea

5mm Stainless  Fits 5mm shaft and has an outside diameter of .470 (12mm).   $4.00 ea

1/8"  Stainless Steel made to fit a 1/8 shaft. Has an outside diameter of 8mm. $3.00ea