Replacement Parts Kit includes Trimmer Blade Head*1, Replacement Blade*8, Screw*4, if you have any questions about the product, you can contact us, we will solve it for you. Serrated Edges are ideal for thicker grasses that your strings may not be able to handle,but Avoid using this accessory for edging, working alongside brick, chain, or wooden fencing. Greenworks Replacement Blade Spool Compatible with Greenworks Single Line 24V and G-MAX 40V String Trimmer Models. Greenworks Replacement Blade fit for 24V string trimmers- 21342, 2100302, 2102902, 2103202. Polycarbonate Bladed Trimmer Head Compatible with Greenworks 21302 21332 21342 20V 24V 40V String Edger.Compatible with Greenworks Cordless String Trimmer Models:29252, 21332, 21262, 21312, 21342, 2100302,21222A, 21602, 21062, 21132, 21242, 21282, 21302.