Spanner to loosen stubborn Panavision iris rod collets. Machined from 1/4" T6061 Aluminum and handsomely anodized black. This should only be used for loosening. Using it for tightening can cause damage to the collet or IRB. The bottle opener on the handle makes this one multi-talented tool! (One side for work, and one side for play) A perfect gift for that 1st. AC who keeps hiring you.