WA0037 Replacement Spool Cap Cover for WG184, WG190, WG191, WG168 automatic feed string trimmers. This spool cap is made of high-quality ABS material for durability. The WA0037 spool cap helps secure the trimmer line on the spool and prevents debris from getting caught inside, protecting the trimmer from damage. Designed for use with 40-volt models including WG168, WG184, WG190 string trimmers. Compatible with WA0014 Trimmer Spool as a replacement part. Easy to install with no tools required—simply snaps into place over the spool line. Color: Black. Material: ABS. Package includes: 4 x WA0037 Replacement Spool Caps. Other items not included. Note: Display lighting and monitor settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.