Safe to use on all PEX to wire applications and all brands of PEX tubing from 3/8” (10 mm) to 5/8” (16 mm) inside diameters. Heavy-duty, 12-gauge (2.5 mm) clips will not jam, break, or damage PEX. Clip connection allows some PEX movement to avoid abrasion. Compatible with Malco No. PT1 PEX To Wire Tool.