Pearl CLH-930 Closed Hat With Boom Hi-Hat Cymbal Holder with Uni-Lock Tilter This Hi-Hat Cymbal Holder pack includes a boom arm, infinitely adjustable Uni-Lock tilter, pivot-action seat cup and ergonomic UltraGrip wing nuts / wing bolts This Hi-Hat Cymbal Holder pack includes a boom arm, infinitely adjustable Uni-Lock tilter, pivot-action seat cup and ergonomic UltraGrip wing nuts / wing bolts