BOBBINS & SPOOLS Inches | Millimeters Bobbin: 3-EL Equipment Type: N E Butt/Wardwell Flange Diameter: 3.50" Traverse: 7.5" to 13.0" in 1/2" increments Barrel OD: Smooth, .810 typical Bore Size(s): .385" or .510" Drive Type: 10 tooth ratchet Notes: With or without nub << Back to List