SF-4 Drill Guides: Because of the wide range 
of sizes required, 
Drill Guides for the Model SF-4 are not included
in the price of the fixture. 

-For drilling cross holes in round stock
-Increases the versatility of the fixture
-Adapted to accept two standard O.D. drill bushings - 
only one is necessary
-Price of SF-4R attachment does not include drill bushing
-Rapid, positive cam-lock action on each part even with 
dimensional variations.
-Milled 1/2" slot for easy holding.
-Drill guide changes made quickly.
-Variable hole location from APEX with positive stop
-Simple adjustment to accommodate all sizes
1/4" to 2" hexagons, nuts, 
bolts, etc. Now you can drill cross holes in round 
of hex stock.