BOBBINS & SPOOLS Inches | Millimeters Bobbin: #4-SDF Equipment Type: N E Butt/Wardwell Flange Diameter: 3.375" Traverse: 6.0" to 8.0" in 1/2" increments Barrel OD: Smooth, 1.062 typical Bore Size(s): .406", .441",.506' Drive Type: 10 tooth ratchet Notes: With or without nub << Back to List