JBL's WK-4 Wheel Caster Kit for SRX728S and VRX918S improves the mobility of your speakers by putting them on wheels. These casters are designed specifically for the SRX728S and VRX918S speakers and the speaker enclosures come pre-threaded for easy and almost instant installation. Two of these casters are fixed and two swivel.
Improved Mobility
By adding casters to your SRX728S and VRX918S speakers you get ease of mobility, and the pre-threaded enclosures make installing a snap.