The needle of system 4463 KK has a extra narrow spade point for working leather, synthetic leather and other coated materials – never for woven fabric, since the cutting action would sever the weave threads. The KK version has a short shank butt. It is used in industrial sewing machines for leather and synthetic-leather work, where the cutting point produces a clean puncture. Suitable machine classes are found, among others, at Pfaff (classes 3517, 3519, 3520, 3538), Willcox (classes 5463, 5467, 5463 ALL CLASSES, 5467 - 801) and Golden Wheel (classes CS-5940, CS-5940M, CS-5941).
Thinner needle sizes are used, among others, for thinner to medium-weight leather, and the thicker versions for very thick, firm leather and multi-layer leather joins. As sewing thread, a bonded polyester or nylon thread such as Amann Saba or Coats Dabond is usually recommended, in a thickness matching the needle size chosen. A cutting point is required here to create clean puncture channels in firm materials.