Briggs & Stratton 5020639SM Extension Spring NetSuite-ID_670044 This 3-3/4" LH spool trimmer

This 3-3/4" LH spool trimmer head speed feed takes 30 seconds or less to load line and is designed for medium to heavy duty applications

Crankshaft: 1" x 3-3/16"

Z-Force 48

Deck belt for 52" deck on Lazer Z

ensuring it performs effectively without compromising user safety

Briggs & Stratton 5020639SM Extension Spring NetSuite-ID_670044 This 3-3/4" LH spool trimmerKeep your outdoor power equipment running smoothly with genuine OEM replacement parts. Designed to meet the highest standards of quality and performance, these parts ensure your equipment operates efficiently and reliably. Many parts look similar, so its crucial to ensure youre choosing the right replacement for your original equipment or engine model. Not sure? Use our Parts Lookup Tool to view part diagrams and find the correct replacement. Fits