WA0037 Replacement Spool Cap Cover for WG184, WG190, WG191, WG168 automatic feed string trimmers. WA0037 Spool Cap, Grass Trimmer Spool Cap Cover made of high quality ABS, durable for use. WA0037 Replacement Spool Cap helps protect trimmer line and fixed spool, prevents debris from getting caught inside, and helps avoid damage to the trimmer. WA0037 Replacement Grass Trimmer Spool Cap Cover is compatible with 40-volt models WG168, WG184, WG190 string trimmer parts. WA0037 Replacement Cap works with WA0014 Trimmer Spool as a replacement part. Easy to install no tools required. Snaps into place over the spool line. Color: Black Material: ABS Package Contents: 4 x WA0037 Replacement Spool Cap Note: Light and screen display settings may cause slight color differences between the image and the actual item. Measurement may vary by +/- 1-3 cm.