BOBBINS & SPOOLS Inches | Millimeters Bobbin: #4-EL Equipment Type: N E Butt/Wardwell Flange Diameter: 101.60mm Traverse: 228.60mm to 406.40mm in 12.7mm increments Barrel OD: Smooth, 20.57mm typical Bore Size(s): 9.78mm or 12.95mm Drive Type: 10 tooth ratchet Notes: With or without nub << Back to List