Item number: ACC-SDF-178C Description: Number of pieces per pack: 20 pieces/10 pairs, packed in a plastic seal bag Available Size: 18mm, 20mm, 21mm, 22mm, 24mm Tube Diameter: 1.78mm Tip Diameter: 0.8mm Color/Finish: Steel Color Material: Stainless Steel Function: 2 Telescopic Shoulder Curved Spring Bars, 1.1mm tip dia.