XCP-DS FIT Size 0 Periapical (black) Universal Biteblock Refill. 2/pk The XCP-DS FIT Universal Sensor Holders Stretch to FITAny Size - Any Brand! Self-adjusting clip stretches to fit size 0-2. #1 Selling Autoclavable Sensor Holder in the USA.* One Holder FITS Size #1 and #2 Digital Sensors. Fast and easy to load. Color-coded for fast assembly. Less Flexing - Rigid sensor support keeps sensor positioned accurately. Silicone-cushioned edges help provide patient comfort. Use with relaxed-fit sensor cover.