Ryobi AC14HCA Genuine OEM One+ Replacement Spool Cap for Ryobi One+ 18V, 24V, 40V Cordless Trimmers COMPATIBLE WITH Ryobi One+ 18V, 24V, or 40V cordless strimmers EASY REPLACEMENT with the press-release clamps STURDY PLASTIC material designed to keep your Ryobi string trimmers running like the day you purchased them OPTIMIZED FOR counterclockwise strimmer rotation