Multi-Size Compatibility: The copper tube fittings crimping tool equipped with dies for 1″, 3/4″, 1/2″ F877 Stainless PEX Press Sleeves & Copper Pipe, and 1″, 3/4″, 5/8″, 1/2″, 3/8″ ASTM F1807 PEX Pipe Copper Rings, ensuring versatility for various plumbing needs.