Adjustable Speaker Pole with Easy Lock System The K&M 21376 Easy Lock speaker pole is a sturdy way to mount a speaker to a subwoofer. This steel speaker pole features a patented expanding mandrel connector on both sides for quick and easy mounting. What’s more, the 21376 speaker pole features K&M’s Easy Lock system for a secure setup. Easy Lock uses plastic expanding splints to ensure you enjoy a tight fit and a vibration-free operating experience. GearNuts appreciates how the stepped height adjustment makes repeating setups a walk in the park. You’ll also benefit from a locking screw and safety hook. Securely mount your speaker with the K&M 21376 Easy Lock speaker pole.K&M 21376 Easy Lock Speaker Pole Features: Sturdy steel speaker pole for speakers and subs with flange adapters Patent-pending mandrel connector delivers a secure connection Stepped height adjustment enables repeatable placement Easy Lock system enables lightning-fast setups with