Quantity: 1-Arm (540858 Posterior (yellow pins) Stainless Steel Indicator Arm)For use with: 540860 Posterior (yellow) Ring DENTSPLY Rinn Biteblocks for film/psp and digital sensors (see Digital Sensors for listing) XCP Posterior (yellow pins) Stainless Steel Indicator Arm XCP Extension Cone Paralleling Your Key to Accurate Positioning: Works with Film, PSP and Digital Sensors. Quickly align the x-ray tube to media. Accurate positioning and precise x-rays prevent cone cutting. Easy to assemble with color coded XCP components. Patented color coding: Anterior-Blue Posterior-Yellow Red-Bitewing. Autoclavable for low cost per use.