Pearl Uni-Lock Hi Hat Attachment HA-130The Pearl HA 130 Hi Hat Bass Drum Attachment clamp is a must for the double bass drummer. By attaching your hi hat stand to the hoop of your secondary bass drum, the HA 130 keeps your hi hat and bass drum pedals in secure adjoining positions, making foot transition easy and efficient. Simply fold the hi hat stand legs in, attach the insulated hoop clamp to the bass drum, secure the two sided Quick Set clamp to your stand, and use the Right Angle Bar