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Double Loop Wire
3:1 (3 loops per 1 inch) Width of Spines: Minimum 1/4” Maximum 1 1/4”
2:1 (2 loops per 1 inch) Width of Spines: Minimum 5/8” Maximum 1 1/4”
Length of Spine up to 11 7/8”
Plastic Spiral
4:1 (4 coils per 1 inch) Width of Spines: Minimum 6mm or 3/16” Maximum 35mm or 1 3/8”
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