WA0037 Replacement spool cap for Worx WG184 WG190 WG191 WG168 Automatic Feed Trimmer. WA0037 Spool cap for WORX, the lawnmower spool cap is made of high-quality ABS for durability. WA0037 WORX replacement spool cap protects the trim line holding the spool and prevents weeds from getting stuck inside and damaging the trimmer. WA0037 Replacement lawnmower spool cap for 40-volt models WG168 weed and grass trimmer, WG184 trimmer parts, WG190 string trimmer parts. WA0037 Replacement cap for use with WA0014 trim spool for Worx spare parts. Easy to install, no tools required, snaps onto the string shaft. Color: Black Material: ABS Package Contents: 4 * WA0037 Replacement Spool Caps are only the above package content, other products are not included. Note: Light photography and different monitors may cause the color of the item in the picture to differ slightly from the actual item. Measurement tolerance is +/- 1-3 cm.