Pferd 81657 Standard Twist Knot Wheel 4" Pferd Sale! from 21440 /per Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Standard Twist Knot Wheel, 4", .014 CS Wire, 1/2-3/8" Arbor Hole SKU:PFE 81657