Dual oval copper Nicopress sleeves make a strong connection without leader crossing over itself inside the sleeve. Compress with cup style crimping tool. Select correct sleeve based on leader diameter. B1:.90mm-1.05mm B4:1.2mm-1.45mm C:1.6mm-2.05mm G:2.45mm-2.86mm. 50-sleeve packs. Click the item# to select bright or black finish. Click for the Nicopress Sleeve Chart.